Greyed out imports on google drive

Hello, I have created an audio file via mp4 format on my PC, all dandy like with real guitars and stuff. I just wanted to import it to the Garage Band and do some editing on my Ipad. The problem I am getting is that the file is greyed out after I have imported it to Icloud Drive. It's giving me a headache trying to figure this out.

My only guess is Garage band doesn't support mp4 files. I suppose I need to convert it unless there is some sort of work around.

Please help.