I've seen so many people struggling to upload art from their mobile device so I figured I'd make a little tutorial. Now note, this is compatible for iPhones and Apple products. I'm sure Android and other devices have a similar way :)
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Step 1: Save the image to your camera roll like you'd normally do.
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Step 2: Share & save the art to your files. This can be done by doing the following
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Step 3: Go to upload your art like normal however click Choose Files instead of Choose From Gallery. From there it should've uploaded with no issues :)