diff --git a/CHANGELOG.md b/CHANGELOG.md
index 303bebd..776881b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Tsacdop Changelog
 
+## v0.4.7
+
+Release date 2020/7/18
+
+### Bugs fixed
+
+* Ompl files form other platform import error.
+* Audio cache did't work.
+
 ## v0.4.6
 
 Release date 2020/7/17
diff --git a/lib/generated/intl/messages_en.dart b/lib/generated/intl/messages_en.dart
index 02673ef..25c1cc9 100644
--- a/lib/generated/intl/messages_en.dart
+++ b/lib/generated/intl/messages_en.dart
@@ -198,6 +198,7 @@ class MessageLookup extends MessageLookupByLibrary {
     "privacyPolicy" : MessageLookupByLibrary.simpleMessage("Privacy Policy"),
     "published" : m20,
     "recoverSubscribe" : MessageLookupByLibrary.simpleMessage("Recover subscribe"),
+    "refreshArtwork" : MessageLookupByLibrary.simpleMessage("Update artwork"),
     "remove" : MessageLookupByLibrary.simpleMessage("Remove"),
     "removeConfirm" : MessageLookupByLibrary.simpleMessage("Remove confirm"),
     "removePodcastDes" : MessageLookupByLibrary.simpleMessage("Are you sure you want to unsubscribe?"),
diff --git a/lib/generated/intl/messages_zh-Hans.dart b/lib/generated/intl/messages_zh-Hans.dart
index cc82e5c..e5de267 100644
--- a/lib/generated/intl/messages_zh-Hans.dart
+++ b/lib/generated/intl/messages_zh-Hans.dart
@@ -198,6 +198,7 @@ class MessageLookup extends MessageLookupByLibrary {
     "privacyPolicy" : MessageLookupByLibrary.simpleMessage("隐私条款"),
     "published" : m20,
     "recoverSubscribe" : MessageLookupByLibrary.simpleMessage("恢复订阅"),
+    "refreshArtwork" : MessageLookupByLibrary.simpleMessage("更新头像"),
     "remove" : MessageLookupByLibrary.simpleMessage("移除"),
     "removeConfirm" : MessageLookupByLibrary.simpleMessage("取消订阅"),
     "removePodcastDes" : MessageLookupByLibrary.simpleMessage("您确认要取消订阅吗？"),
@@ -290,8 +291,8 @@ class MessageLookup extends MessageLookupByLibrary {
     "toastRecoverFailed" : MessageLookupByLibrary.simpleMessage("恢复订阅失败"),
     "toastRemovePlaylist" : MessageLookupByLibrary.simpleMessage("从播放列表移除"),
     "toastSettingSaved" : MessageLookupByLibrary.simpleMessage("设置已保存"),
-    "toastTimeEqualEnd" : MessageLookupByLibrary.simpleMessage("与结束时间相同"),
-    "toastTimeEqualStart" : MessageLookupByLibrary.simpleMessage("与起始时间相同"),
+    "toastTimeEqualEnd" : MessageLookupByLibrary.simpleMessage("与结束时刻相同"),
+    "toastTimeEqualStart" : MessageLookupByLibrary.simpleMessage("与起始时刻相同"),
     "understood" : MessageLookupByLibrary.simpleMessage("了解"),
     "undo" : MessageLookupByLibrary.simpleMessage("撤销"),
     "unlike" : MessageLookupByLibrary.simpleMessage("取消喜欢"),
diff --git a/lib/generated/l10n.dart b/lib/generated/l10n.dart
index 1cba085..527e681 100644
--- a/lib/generated/l10n.dart
+++ b/lib/generated/l10n.dart
@@ -533,7 +533,7 @@ class S {
     return Intl.message(
       'Rate on Play',
       name: 'feedbackPlay',
-      desc: '',
+      desc: 'Rate on Google Play Store.\nUser can tap to open play link.',
       args: [],
     );
   }
@@ -583,7 +583,7 @@ class S {
     return Intl.message(
       'Group existed',
       name: 'groupExisted',
-      desc: '',
+      desc: 'Group name validate in add group dialog. User can\'t add group with same name.',
       args: [],
     );
   }
@@ -822,7 +822,7 @@ class S {
     return Intl.message(
       'Like date',
       name: 'likeDate',
-      desc: '',
+      desc: 'Favorite tab, sort by like date.',
       args: [],
     );
   }
@@ -862,7 +862,7 @@ class S {
     return Intl.message(
       'Mark',
       name: 'mark',
-      desc: 'The short the best',
+      desc: 'In listen history page, if a episode is marked as listened.',
       args: [],
     );
   }
@@ -1271,6 +1271,16 @@ class S {
     return Intl.message(
       'Recover subscribe',
       name: 'recoverSubscribe',
+      desc: 'User can recover subscribe podcast after remove it in subscribe history page.',
+      args: [],
+    );
+  }
+
+  /// `Update artwork`
+  String get refreshArtwork {
+    return Intl.message(
+      'Update artwork',
+      name: 'refreshArtwork',
       desc: '',
       args: [],
     );
@@ -1281,7 +1291,7 @@ class S {
     return Intl.message(
       'Remove',
       name: 'remove',
-      desc: '',
+      desc: 'Remove not "removed". \nRemove a podcast or a group.',
       args: [],
     );
   }
@@ -1554,7 +1564,7 @@ class S {
     return Intl.message(
       'Discovery Features Again',
       name: 'settingsDiscovery',
-      desc: '',
+      desc: 'Reset feature discovery state. User tap it and restart app, will see features tutorial again.',
       args: [],
     );
   }
@@ -2054,7 +2064,7 @@ class S {
     return Intl.message(
       'Last time $time',
       name: 'timeLastPlayed',
-      desc: '',
+      desc: 'Show last time stop position  in player when a episode have been played.',
       args: [time],
     );
   }
@@ -2094,7 +2104,7 @@ class S {
     return Intl.message(
       'Discovery feature reopened, pleast restart the app',
       name: 'toastDiscovery',
-      desc: '',
+      desc: 'Toast displayed when user tap Discovery Features Again in settings page.',
       args: [],
     );
   }
@@ -2204,7 +2214,7 @@ class S {
     return Intl.message(
       'Time is equal to end time',
       name: 'toastTimeEqualEnd',
-      desc: '',
+      desc: 'User can\'t choose the same time as schedule end time.',
       args: [],
     );
   }
@@ -2214,7 +2224,7 @@ class S {
     return Intl.message(
       'Time is equal to start time',
       name: 'toastTimeEqualStart',
-      desc: '',
+      desc: 'User can\'t choose the same time as schedule start time.',
       args: [],
     );
   }
diff --git a/lib/home/about.dart b/lib/home/about.dart
index 3cc3ff4..7c9d3c8 100644
--- a/lib/home/about.dart
+++ b/lib/home/about.dart
@@ -6,7 +6,7 @@ import 'package:line_icons/line_icons.dart';
 
 import '../util/context_extension.dart';
 
-const String version = '0.4.6';
+const String version = '0.4.7';
 
 class AboutApp extends StatelessWidget {
   _launchUrl(String url) async {
diff --git a/lib/l10n/intl_en.arb b/lib/l10n/intl_en.arb
index 275b3e2..346a7cb 100644
--- a/lib/l10n/intl_en.arb
+++ b/lib/l10n/intl_en.arb
@@ -107,7 +107,9 @@
   "feedbackGithub": "Submit issue",
   "@feedbackGithub": {},
   "feedbackPlay": "Rate on Play",
-  "@feedbackPlay": {},
+  "@feedbackPlay": {
+    "description": "Rate on Google Play Store.\nUser can tap to open play link."
+  },
   "feedbackTelegram": "Join group",
   "@feedbackTelegram": {},
   "fonts": "Fonts",
@@ -121,7 +123,9 @@
   "goodNight": "Good Night",
   "@goodNight": {},
   "groupExisted": "Group existed",
-  "@groupExisted": {},
+  "@groupExisted": {
+    "description": "Group name validate in add group dialog. User can't add group with same name."
+  },
   "groupFilter": "Group filter",
   "@groupFilter": {},
   "groupRemoveConfirm": "Are you sure you want to delete this group? Podcasts will be moved to Home group.",
@@ -171,7 +175,9 @@
   "liked": "Liked",
   "@liked": {},
   "likeDate": "Like date",
-  "@likeDate": {},
+  "@likeDate": {
+    "description": "Favorite tab, sort by like date."
+  },
   "listen": "Listen",
   "@listen": {},
   "listened": "Listened",
@@ -180,7 +186,7 @@
   "@loadMore": {},
   "mark": "Mark",
   "@mark": {
-    "description": "The short the best"
+    "description": "In listen history page, if a episode is marked as listened."
   },
   "markConfirm": "Mark confirm",
   "@markConfirm": {},
@@ -291,9 +297,15 @@
     }
   },
   "recoverSubscribe": "Recover subscribe",
-  "@recoverSubscribe": {},
+  "@recoverSubscribe": {
+    "description": "User can recover subscribe podcast after remove it in subscribe history page."
+  },
+  "refreshArtwork": "Update artwork",
+  "@refreshArtwork": {},
   "remove": "Remove",
-  "@remove": {},
+  "@remove": {
+    "description": "Remove not \"removed\". \nRemove a podcast or a group."
+  },
   "removeConfirm": "Remove confirm",
   "@removeConfirm": {
     "description": "unsubscribe podcast dialog"
@@ -354,7 +366,9 @@
   "settingsDefaultGridRecent": "Recent tab",
   "@settingsDefaultGridRecent": {},
   "settingsDiscovery": "Discovery Features Again",
-  "@settingsDiscovery": {},
+  "@settingsDiscovery": {
+    "description": "Reset feature discovery state. User tap it and restart app, will see features tutorial again."
+  },
   "settingsEnableSyncing": "Enable syncing",
   "@settingsEnableSyncing": {},
   "settingsEnableSyncingDes": "Refresh all podcasts in the background to get leatest episodes",
@@ -455,6 +469,7 @@
   "@systemDefault": {},
   "timeLastPlayed": "Last time {time}",
   "@timeLastPlayed": {
+    "description": "Show last time stop position  in player when a episode have been played.",
     "placeholders": {
       "time": {}
     }
@@ -474,7 +489,9 @@
   "toastAddPlaylist": "Added to playlist",
   "@toastAddPlaylist": {},
   "toastDiscovery": "Discovery feature reopened, pleast restart the app",
-  "@toastDiscovery": {},
+  "@toastDiscovery": {
+    "description": "Toast displayed when user tap Discovery Features Again in settings page."
+  },
   "toastFileError": "File error, subscribe failed",
   "@toastFileError": {},
   "toastFileNotValid": "File not valid",
@@ -500,9 +517,13 @@
   "toastSettingSaved": "Setting saved",
   "@toastSettingSaved": {},
   "toastTimeEqualEnd": "Time is equal to end time",
-  "@toastTimeEqualEnd": {},
+  "@toastTimeEqualEnd": {
+    "description": "User can't choose the same time as schedule end time."
+  },
   "toastTimeEqualStart": "Time is equal to start time",
-  "@toastTimeEqualStart": {},
+  "@toastTimeEqualStart": {
+    "description": "User can't choose the same time as schedule start time."
+  },
   "understood": "Understood",
   "@understood": {},
   "undo": "UNDO",
diff --git a/lib/l10n/intl_zh_Hans.arb b/lib/l10n/intl_zh_Hans.arb
index d7e0038..8168ce8 100644
--- a/lib/l10n/intl_zh_Hans.arb
+++ b/lib/l10n/intl_zh_Hans.arb
@@ -107,7 +107,9 @@
   "feedbackGithub": "提交Issue",
   "@feedbackGithub": {},
   "feedbackPlay": "Play评价",
-  "@feedbackPlay": {},
+  "@feedbackPlay": {
+    "description": "Rate on Google Play Store.\nUser can tap to open play link."
+  },
   "feedbackTelegram": "加入小组",
   "@feedbackTelegram": {},
   "fonts": "字体",
@@ -121,7 +123,9 @@
   "goodNight": "晚安",
   "@goodNight": {},
   "groupExisted": "组名已使用",
-  "@groupExisted": {},
+  "@groupExisted": {
+    "description": "Group name validate in add group dialog. User can't add group with same name."
+  },
   "groupFilter": "分组",
   "@groupFilter": {},
   "groupRemoveConfirm": "您确认要移除该分组吗？播客将被移动到 Home 分组。",
@@ -171,7 +175,9 @@
   "liked": "已收藏",
   "@liked": {},
   "likeDate": "收藏日期",
-  "@likeDate": {},
+  "@likeDate": {
+    "description": "Favorite tab, sort by like date."
+  },
   "listen": "收听",
   "@listen": {},
   "listened": "已收听",
@@ -180,7 +186,7 @@
   "@loadMore": {},
   "mark": "标记",
   "@mark": {
-    "description": "The short the best"
+    "description": "In listen history page, if a episode is marked as listened."
   },
   "markConfirm": "确认标记",
   "@markConfirm": {},
@@ -291,9 +297,15 @@
     }
   },
   "recoverSubscribe": "恢复订阅",
-  "@recoverSubscribe": {},
+  "@recoverSubscribe": {
+    "description": "User can recover subscribe podcast after remove it in subscribe history page."
+  },
+  "refreshArtwork": "更新头像",
+  "@refreshArtwork": {},
   "remove": "移除",
-  "@remove": {},
+  "@remove": {
+    "description": "Remove not \"removed\". \nRemove a podcast or a group."
+  },
   "removeConfirm": "取消订阅",
   "@removeConfirm": {
     "description": "unsubscribe podcast dialog"
@@ -354,7 +366,9 @@
   "settingsDefaultGridRecent": "最近页",
   "@settingsDefaultGridRecent": {},
   "settingsDiscovery": "再次功能介绍",
-  "@settingsDiscovery": {},
+  "@settingsDiscovery": {
+    "description": "Reset feature discovery state. User tap it and restart app, will see features tutorial again."
+  },
   "settingsEnableSyncing": "开启自动更新",
   "@settingsEnableSyncing": {},
   "settingsEnableSyncingDes": "在后台更新所有订阅播客",
@@ -455,6 +469,7 @@
   "@systemDefault": {},
   "timeLastPlayed": "上次播放{time}",
   "@timeLastPlayed": {
+    "description": "Show last time stop position  in player when a episode have been played.",
     "placeholders": {
       "time": {}
     }
@@ -474,7 +489,9 @@
   "toastAddPlaylist": "添加到播放列表",
   "@toastAddPlaylist": {},
   "toastDiscovery": "重启应用后可查看",
-  "@toastDiscovery": {},
+  "@toastDiscovery": {
+    "description": "Toast displayed when user tap Discovery Features Again in settings page."
+  },
   "toastFileError": "文件错误，导入失败",
   "@toastFileError": {},
   "toastFileNotValid": "文件错误",
@@ -499,10 +516,14 @@
   "@toastRemovePlaylist": {},
   "toastSettingSaved": "设置已保存",
   "@toastSettingSaved": {},
-  "toastTimeEqualEnd": "与结束时间相同",
-  "@toastTimeEqualEnd": {},
-  "toastTimeEqualStart": "与起始时间相同",
-  "@toastTimeEqualStart": {},
+  "toastTimeEqualEnd": "与结束时刻相同",
+  "@toastTimeEqualEnd": {
+    "description": "User can't choose the same time as schedule end time."
+  },
+  "toastTimeEqualStart": "与起始时刻相同",
+  "@toastTimeEqualStart": {
+    "description": "User can't choose the same time as schedule start time."
+  },
   "understood": "了解",
   "@understood": {},
   "undo": "撤销",
diff --git a/lib/podcasts/podcast_detail.dart b/lib/podcasts/podcast_detail.dart
index be4d54d..e5fbd25 100644
--- a/lib/podcasts/podcast_detail.dart
+++ b/lib/podcasts/podcast_detail.dart
@@ -149,14 +149,17 @@ class _PodcastDetailState extends State<PodcastDetail> {
       padding: EdgeInsets.only(top: 40, left: 80, right: 130),
       alignment: Alignment.topLeft,
       child: Container(
-          padding: EdgeInsets.symmetric(vertical: 10),
-          child: Text(widget.podcastLocal.title,
-              maxLines: 2,
-              overflow: TextOverflow.ellipsis,
-              style: Theme.of(context)
-                  .textTheme
-                  .headline5
-                  .copyWith(color: Colors.white))),
+        padding: EdgeInsets.symmetric(vertical: 10),
+        child: Text(
+          widget.podcastLocal.title,
+          maxLines: 2,
+          overflow: TextOverflow.ellipsis,
+          style: Theme.of(context)
+              .textTheme
+              .headline5
+              .copyWith(color: Colors.white),
+        ),
+      ),
     );
   }
 
diff --git a/lib/settings/storage.dart b/lib/settings/storage.dart
index 71c2c42..0bfc18d 100644
--- a/lib/settings/storage.dart
+++ b/lib/settings/storage.dart
@@ -20,8 +20,13 @@ class _StorageSettingState extends State<StorageSetting>
   AnimationController _controller;
   Animation<double> _animation;
   _getCacheMax() async {
-    int cache = await cacheStorage.getInt();
-    int value = cache == 0 ? 200 : cache ~/ (1024 * 1024);
+    int cache =
+        await cacheStorage.getInt(defaultValue: (200 * 1024 * 1024).toInt());
+    if (cache == 0) {
+      await cacheStorage.saveInt((200 * 1024 * 1024).toInt());
+      cache = 200 * 1024 * 1024;
+    }
+    int value = cache ~/ (1024 * 1024);
     if (value > 100) {
       _controller = AnimationController(
           vsync: this, duration: Duration(milliseconds: value * 2));
diff --git a/lib/state/audio_state.dart b/lib/state/audio_state.dart
index 89b530e..516ee76 100644
--- a/lib/state/audio_state.dart
+++ b/lib/state/audio_state.dart
@@ -671,7 +671,7 @@ class AudioPlayerTask extends BackgroundAudioTask {
   bool _lostFocus;
   bool _playing;
   bool _stopAtEnd;
-  int cacheMax;
+  int _cacheMax;
   bool get hasNext => _queue.length > 0;
 
   MediaItem get mediaItem => _queue.length > 0 ? _queue.first : null;
@@ -699,6 +699,7 @@ class AudioPlayerTask extends BackgroundAudioTask {
   Future<void> onStart() async {
     _stopAtEnd = false;
     _lostFocus = false;
+
     var playerStateSubscription = _audioPlayer.playbackStateStream
         .where((state) => state == AudioPlaybackState.completed)
         .listen((state) {
@@ -759,7 +760,7 @@ class AudioPlayerTask extends BackgroundAudioTask {
     } else {
       await AudioServiceBackground.setQueue(_queue);
       await AudioServiceBackground.setMediaItem(mediaItem);
-      await _audioPlayer.setUrl(mediaItem.id, cacheMax);
+      await _audioPlayer.setUrl(mediaItem.id, _cacheMax);
       print(mediaItem.title);
       Duration duration = await _audioPlayer.durationFuture;
       if (duration != null)
@@ -781,11 +782,14 @@ class AudioPlayerTask extends BackgroundAudioTask {
     if (_skipState == null) {
       if (_playing == null) {
         _playing = true;
-        int cacheMax =
-            await cacheStorage.getInt(defaultValue: 200 * 1024 * 1024);
-
+        _cacheMax = await cacheStorage.getInt(
+            defaultValue: (200 * 1024 * 1024).toInt());
         // await AudioServiceBackground.setQueue(_queue);
-        await _audioPlayer.setUrl(mediaItem.id, cacheMax);
+        if (_cacheMax == 0) {
+          await cacheStorage.saveInt((200 * 1024 * 1024).toInt());
+          _cacheMax = 200 * 1024 * 1024;
+        }
+        await _audioPlayer.setUrl(mediaItem.id, _cacheMax);
         var duration = await _audioPlayer.durationFuture;
         if (duration != null)
           await AudioServiceBackground.setMediaItem(
@@ -886,7 +890,7 @@ class AudioPlayerTask extends BackgroundAudioTask {
       _queue.insert(0, mediaItem);
       await AudioServiceBackground.setQueue(_queue);
       await AudioServiceBackground.setMediaItem(mediaItem);
-      await _audioPlayer.setUrl(mediaItem.id, cacheMax);
+      await _audioPlayer.setUrl(mediaItem.id, _cacheMax);
       Duration duration = await _audioPlayer.durationFuture ?? Duration.zero;
       AudioServiceBackground.setMediaItem(
           mediaItem.copyWith(duration: duration.inMilliseconds));
diff --git a/lib/state/podcast_group.dart b/lib/state/podcast_group.dart
index 51736b7..20582b5 100644
--- a/lib/state/podcast_group.dart
+++ b/lib/state/podcast_group.dart
@@ -464,18 +464,19 @@ Future<void> subIsolateEntryPoint(SendPort sendPort) async {
               await Dio().get<List<int>>(p.itunes.image.href,
                   options: Options(
                     responseType: ResponseType.bytes,
-                    receiveTimeout: 60000,
+                    receiveTimeout: 90000,
                   ));
           imageUrl = p.itunes.image.href;
           img.Image image = img.decodeImage(imageResponse.data);
           thumbnail = img.copyResize(image, width: 300);
         } catch (e) {
           try {
-            Response<List<int>> imageResponse = await Dio(BaseOptions(
-              connectTimeout: 20000,
-              receiveTimeout: 60000,
-            )).get<List<int>>(item.imgUrl,
-                options: Options(responseType: ResponseType.bytes));
+            Response<List<int>> imageResponse =
+                await Dio().get<List<int>>(item.imgUrl,
+                    options: Options(
+                      responseType: ResponseType.bytes,
+                      receiveTimeout: 90000,
+                    ));
             imageUrl = item.imgUrl;
             img.Image image = img.decodeImage(imageResponse.data);
             thumbnail = img.copyResize(image, width: 300);
diff --git a/lib/state/refresh_podcast.dart b/lib/state/refresh_podcast.dart
index b57b96f..c33d048 100644
--- a/lib/state/refresh_podcast.dart
+++ b/lib/state/refresh_podcast.dart
@@ -7,12 +7,13 @@ import '../local_storage/key_value_storage.dart';
 import '../local_storage/sqflite_localpodcast.dart';
 import '../type/podcastlocal.dart';
 
-enum RefreshState { none, fetch, error }
+enum RefreshState { none, fetch, error, artwork }
 
 class RefreshItem {
   String title;
   RefreshState refreshState;
-  RefreshItem(this.title, this.refreshState);
+  bool artwork;
+  RefreshItem(this.title, this.refreshState, {this.artwork = false});
 }
 
 class RefreshWorker extends ChangeNotifier {
diff --git a/pubspec.yaml b/pubspec.yaml
index c79cc15..a16b8d1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,7 +1,7 @@
 name: tsacdop
 description: An easy-use podacasts player.
 
-version: 0.4.6+22
+version: 0.4.7+23
 
 environment:
   sdk: ">=2.6.0 <3.0.0"