Iphone, choosing file for internet?

Ok so I'm trying to enter many modelling comps on my phone as I don't have a computer. I'm using safari on my IPHONE and I need to upload a photo for this comp. But of course I can't simply just "choose file".Is there any app I can download that will maybe convert my file and I can upload it using safari with in the app? Or something along those lines. Any help would be greatly appreciated

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