I have music synced from a music library which has "Store track progress" enabled. Synced music does not remember track progress. E.g., I pause music. Later I go back to plex, and through usage of other apps plex has been flushed from memory. On reload and playing the track I was playing previously the position is not remembered and the track starts playing from the start.
as of today, latest iOS and Windows Server versions installed.
I've labelled this as a bug as it's unclear when it is by design, or not functioning as intended. As an end user it doesn't work as I expect it to.