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« on: January 01, 2021, 02:18:54 AM »
I am working through a similar issue (also a recent refugee from monkey-land). I suspect it's an Android permissions issue. I'm running Android 10 on a Galaxy S9.
If I manually trigger a 'backup stats' from GMMP, that creates the stats.xml file; after that, attempting a reverse sync shows me the "backup stats succeeded" popup (indicating it was able to trigger GMMP's backup) but nothing is actually updated in MB.
If I go into the gmmp folder on my phone, and delete that stats.xml file, then I get the same EACCESS error as appears in your logs, and never see the "backup stats succeeded" message. Looking at the source on github, this is because if the file doesn't exist, the app tries to create it before triggering the GMMP backup, and if the creation errors out it never gets as far as the triggering.
So my guess is that the app can neither read nor write in the /gmmp/ folder. App permissions shows it having permissions on "Storage" but perhaps there's some further nuance to the android permissions.