I've just joined this site for the sole purpose of uploading some public-domain graphics I've developed, but I'm confused about how to go about it.  I've made 4 jumbo-index playing card decks, each in SVG, PNG and GIF formats.  Each deck has 52 cards, plus 2 jokers and 2 backs.  I have both individual cards and sprite sheet for each deck.  The assets can be seen at https://github.com/saulspatz/SVGCards.  So, I've got a lot of files to upload (around 35 MB all told) and I'd like to do it in some organized way.  

I went to the "Submit Art" page, but I'm not exactly sure what to do.  For a particular deck, should I submit all the formats (SVG, PNG, GIF) at the same time, or is it preferable to separate them by format?  If I choose one of the sprite sheets for the preview, should I also attach it as one of the files?

Also, is there a way to upload the files in bulk, without pointing and clicking 600-odd times?  

Thanks for your help.