My problem: I can't upload pictures

To clarify: I use iOS iPad with Pixquare as my drawing app, all PNG JPG and GIF failed to load whenever I try uploading anything picture-related, both dailies and my pfp for example. I'm not sure if I need to subscribe or anything on this web to do that, is there a feature like that or is this genuinely a bug? If anyone has the same issue please push this topic up so staff (dev? mods?) can see it.