Update: I had save compression turned off on the old device. Both maps successfully transferred.

As the title says, I am unable to transfer saves, either between phones, or from phoone to pc. Both phones are on the same version 0.58.0

I've tried both the .Mcv and .McB files it says corrupted.

I just realized one phone is on Android 6.0.1 and the other is on 7.0.

Is there anything I can do about this? I have a lot of work on these two colonies one of which is the mother colony. Both saves are still playable on the old device.