How do i put videos on my psp?

I have the old PSP. (Update Version 3.03). I tried to put videos by copy and pasting them to the "Video" folder, but they never showed up. I also tried making a mproot folder or something like that and copying the videos in there and still, they never showed up. I used psp video 9 but when i'm done converting and trying to copy the video, it says the file can't be recognized. Can someone Please help me with STEP by STEP directions, because i fell like i've tried it all and i'm getting kinna frustrated.