I dont seem to get MT accept playlists. My hunch is that the path to the files isnt correct.
Do I fill in full path in the playlist (m3u) or a relative path?
relative path should work if the playlist is located in the same directory as the files that you are trying to add, otherwise use an absolute path (that will always work)
I am not sure, I think someone reported a problem with DOS formatted paths (backslash vs slash), so thats also something to look for.
You can also adapt the playlist parsing script yourself and do further finetunings if you wish.