If we have audiobooks which are split into multiple files, Plex will not remember what the last file in the audiobook album it was that you last listened to. If we have audiobooks which are combined as single files per book, Plex does not support embedded m4b chapter markers.
I highly recommend against having single-file audiobooks, because if you lose your place, then God help you—especially if you’re using a set-top box app to seek through the book to find your place again. In addition, Plex considers audio files at >90% progress as “complete” and will no longer remember your place. This is especially unfortunate for a single audio file that is 30-40 hours long (which means it would then not keep your place at <3-4 hours remaining).
