Since the 2008 I have been trying to submit my photos with my awesome threadless tees...but it never did work :( am I the only one facing this issue???? And why?

I tried contacting the support a lot of time, but they seem unable to figure out the issue :(

Every time I try to upload a photo I get a screen asking for my order details, I enter them and I always get something like this capture

Maybe Threadless devs should make it easier to submit photos...for example I could just open my order history and click on a certain order to submit photos for that order...

So anybody out there having the same problem I'm facing? Where you able to solve it?

I wish if there are more tees with art on their back!