Mod files

How do I add a .mod file to roll 20?

Convert it to a format that fanburst.com uses, upload it there, find it via the audio interface in game.

I apologize but I do not understand. I checked out fanburst.com, but I'm not quite sure what it is for. My understanding is that the .mod file I have is a bunch of zipped maps.

Oh.  Thought you meant the  .mod music file. Roll20 supports .png and .jpg files for graphics.  You'd need to extract the images from that mod archive file (7zip or WinRaR seem to be able to do that on windows).  Then convert them to either of the above formats if they are in some other format.  Then you can drag them in like any other graphic.

Roll20 does not understand zip files. You need to upload them as separate files. Be sure not to use the GIF format; use JPG (or PNG if transparency is needed) and do not use the .JPEG file extension. You may also want to review the Tutorial (under the Games menu at the top of this page) for an overview of how Roll20 works. It has a few glitches, but the Tutorial can give you a good idea of how Roll20 works.