This may be an issue on Tivimate side, but I have been unable to find a solution yet (maybe there isn't one). Just thought I'd check here if anyone has solutions. I'm using the latest version 3.6, and up-to-date on my Z8 Pro.
I have been unable to use external storage for recording or backups on Tivimate. If I try to change the recording folder, it sees my USB, lets me browse, but when I try to set the folder, it says it failed to change folder location. Also, I tested backup function, and it failed to that location as well. MOL2 records successfully to this location. I also tried reformatting to NTFS, and using Formuler format feature, and it was the same issue each time. It only uses internal storage.
The only reason I am trying Tivimate is that I have 2 different TV sources, antenna and a provider. I just wanted an alternate app for recording, because I am already recording some things on antenna connection. I tried Kodi before Tivimate, but that didn't have PVR for Android.