Adding podcasts to music

I’ve tried to add a “music” folder full of MP3s to my library and it simply won’t work. I don’t know why.

Aside from that, when I play the MP3s (1-2 hour talk shows) there’s no way to drag forward or backward. It seems I have to just listen to the whole thing fro beginning to end. Is there a way to get the slider for mp3s?

Maybe I shouldn’t be adding these as music. Does anyone have any suggestions?