Can't See Iso Game with Open PS2 Loader 0.91

I FTPed an iso game from the internet to the internal hard drive on the PS2. I'm using a mac.
I put it in DVD folder on OPL, the third partition I had created with the format utility.

Open PS2 Loader can't see anything. I renamed the ISO from the first file I found inside the disc image. Its actually a need for speed game. Now it says SLUS.216.58..blahblah.

I don't know if it can't see the directory or If I missed a step. I've had no problem running ISO games from the net when I had hacked my PS3, so I don't see why PS2 is so difficult. Is there a directory setting? Or perhaps its a corrupt ISO. I thought you could just transfer ISO to the internal hard drive and then launch them.

I will try FTPing a different game in the meantime. I want to keep this internal, I don't have an IDE interface to PC or Mac. Just FTP from the PS2. The guides and manuals for Open PS2 Loader aren't very good btw. I will check back to see if you have suggestions.

You're likely to get yourself banned if you keep referring to downloading ISOs, as opposed to creating from your original discs...

Anyway, for OPL ISO filenames have to be of the form SLUS_123.45.Something.iso
In other words, an underscore after the SLUS, not a dot.