Hi,
sorry for the delay, I've been busy lately.
In principle it is possible to manage a PDF, MP3 or video collection, but it would probably not be very comfortable. Here's what you could do: Add your info set types "PDF", "MP3" and "Video" where you name your info fields. The info field HTML can be adjusted individually, for example such that the youtube video is properly embedded (I haven't tried this, but it should be possible). For PDFs you'd have to include the download link. You could do something like
info 1 label: "Title" info 1 html: "{INFO1}"
info 2 label: "File" info 2 html:
"<a href="
www.yoursite.com/downloads/pdfs/{INFO2}">{INFO1}</a>"
Note that JCollection does not manage uploads for you.
HTH,
Thorsten.