I have struggled with this visibility of my music files problem too. My music files and directories are visible using Android File Managers and my PC but quite a few were invisible to my Pi Music Player. This was infuriating. I could find nothing wrong with the problematic directories or files either by using Android Apps or viewing the directories from my PC. I have the Galaxy S9. I tried deleting of several .ini files but that did not help (or actually hurt either because they were in directories that were visible to the Pi Player...so?) What Finally seemed to make the problematic music files and directories visible was use of an App if found in Google Play named "SD Refresh". The app claims to make problematic files on an Android SD card visible to the PC. My PC did not have trouble seeing these files however, it was only the Pi Music Player that had this trouble. So, I thought what the heck....let give it a try it. Using the app You select whatever directories you want it to 'REFRESH' by choosing "Select" and then checkmarking the directories you want to Refresh. I chose my main music file directory which included all of the subdirectories and the problematic directories that were not showing up. I then let the app rescan the all of the directories...it took about 5 minutes but then ....Walla. Micracles do happen. My probematic directories fianally showed up in my Pi Music Player after rescan ... this after a year or more of trying to fix this problem. I even reformatting and recopied all my music files. This fixed most of the visibility problems but, because of some finiky problem (as yet still not understood by myself) not all directories showed up. So, this App may have done the trick, give it a try. Good Luck to all.
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