Games not showing OPL loader

So after many hours of swearing I was able to get OPL loader working on my psxmemcardgen2. I downloaded timesplitters 2 from archive and it didn’t work - the game showed in games list but white screen upon running game.

I then downloaded from myrient and it worked perfect - I downloaded, extracted file, copied to my SD card in DVD folder, and worked first time.

I then followed the EXACT process with 6 other games, and none of them show in the games list. They are all ISO files, I have no idea what I’m doing wrong.

I’m using OPL v1.2.0 beta if that makes a difference.

Please help!