http://community.wikia.com/wiki/Help:Galleries,_Slideshows,_and_Sliders
This is the closest that I was able to get to finding some way to upload albums for a wiki (it doesn't seem like it is possible). Also, you'd think that since Wikia can pull photos from flickr, that it would be natural to make albums in flickr and pull or imbed from there, but flickr is an unusable mess, and the only way to link pictures from it in Wikia seems to be an almost completely useless search tool.
Here is the guide to uploading photos that does *not* mention flickr, and still manages to give a sense of how pointlessly constrained photo uploading is in Wikia:
http://community.wikia.com/wiki/Help:Import_free_images
