Well that really sucks.
It sounds like the file permissions were changed/reset. As a not Motorola user, I have no clue any difference you may have, but I'll try to help.
Judging by your date of June 22, I'm guessing its been a month sence you got this, or was it just rolled out to you in the last few days?
Here a few potential spots to start, theres a high chance you've done them already, but I'll start here.
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If you share a new folder to your device, does it ask permission to "access the folder". You may just have to redo all your syncs.
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- if you where previosuly syncing to the system "root" folder, you can not. (The folder with "Android" and "Pictures". You have to be in a sub-folder. (No idea how long this has been a thing, but will include anyways)).
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Does sync thing (and your file apps) have any new required permissions, obviosuly ensure your running the latest version. It might require a reinstall to retrigger the permission diologues.
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- There is a backup option in the sync thing app, however I have never used it and thus have no idea how "complete" of backup it is.