Google Drive: transfer files only over wifi keeps turning on

In my android version 7.1.1 mobile, I am unable to upload files to

Drive

over mobile network. I am not able to disable

files only over wifi

field from the

of

Drive

. When I disable that it appears to be disabled there. However when I recheck this by clicking back button and coming to

again, I can still see that

files only over wifi

is enabled.