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When the NAS is removed from the streamer, you will not see all the music folders. The various folders can be opened, not all of them. How can you solve the problem?
The WiiM app isn't very good with DLNA. Install BubbleUPnP on your Phone and control with that.
Приложение WiiM не очень хорошо работает с DLNA. Установите BubbleUPnP на свой телефон и управляйте им.