Any chance of automatically deleting bookmarks that refer to deleted files? E.g., when deleting a file or files, why not check the list of bookmarks & delete those that refer to the file being deleted?
Ditto with "Now Playing".
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Also, wouldn't it make sense when automatically creating a bookmark -- e.g., when powering off -- to remember whether the file was actually playing or paused, so that when resuming, you resume either playing or paused, respectively ?