I recently had to format my OnePlus 2 and backed up a few apps, namely Authenticator and two games. First, I did a normal backup, then I used "send latest backup" in the "special features" tab to put the backup into my Google Drive (I didn't know about the sync feature then). Now, TB won't restore the apps after I 1) manually copied the .TIBKP files from my Google Drive to the detected (!) folder on my OP2's internal storage and 2) linked my Drive and used the Sync button in the schedules list to download all backups. The backups don't show up in "Backup/Restore", it says "no backup yet".
I've tried clearing the App's cache which didn't help unfortunately.
I went through all steps on the technical FAQ site numerous times without success.
I am running Linage OS 14.1 (August 31), rooted using their suaddon. F2FS on data and cache.
These backups are very important to me, I have about a dozen accounts linked with my Authenticator which would all be lost. I greatly appreciate all attempts at helping me.