When I click on next on the create card page I get an invalid file error.
You're getting an invalid file error because it's JPG only and you're probably uploading a PNG or something other than JPG. I just changed it to accept PNGs as well, so hopefully it should work for you now. Sorry about that!
Also you need to clarify whether this is US only or international in your FAQ page.
Thanks for the heads up, I forgot that I had that info on the FAQ page.
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