Verizon FRP otg wont read

I recently purchased a s6 and the phone was working when the seller showed the phone. Great.

He reset the phone and I was on my way. Now it has the Google log in and the guy won’t answer text and I don’t know the Gmail login.

Through some research I got the file to do the FRP bypass but when I put in the OTG cable, no file manager pops up.

Any ideas or am I out my money?