There's an option to attach files to a post, like full sized images, zip files, etc. The post will then get a paperclip icon in the top corner. But I would personally recommend that you e-mail rewards, otherwise you'll probably run into the problem of someone exploiting the system by pledging, going in and downloading everything posted previously and then deleting their pledge before they're charged anything.
Wingbat
2015-01-05 12:11:42 +0000 UTC
Hmm thats odd.It would seem they get resized.
Looks like I'll have to sent them via email
Evulchibi
2015-01-05 12:07:12 +0000 UTC
Does patreon resize the image? or is there a secret button I haven't found?