Amazfit Watch faces

I would love to know if it is possible to replace 1 or 2 of the default GTR faces?

I have read here in the AmazFaces App instruction an instruction to rename the file uploaded. Not sure if this is to overwrite one of the default faces? If this is the case, then this sounds promising.

What should the 2 watch face files be renamed to in the 42mm GTR?

Otherwise is there a way to replace 1 or both of the default faces?

You can't replace the default faces unfortunately.