Hello yesterday my problem appeared. I cannot sync 1 playlist to my device. I created a new one and its syncing. My mobile even cannot see this playlist. I tried reinstalling and cleaning cache data.
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Ok, I repaired it. I devided my playlist to 2 new playlists and then i combined them and its working.
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Did that also i copied songs from 1 playlist to another and my mobile still cannot read my playlist. I can see only playlist called Loading..., when i go to my devices and manually choosing playlists to sync i cannot 'click' on this playlist