It's difficult to do that with an iPad because it's not really designed to work as a PC in terms of a file system like an Android tablet (not say it's inferior, just how it works). So while you can take pictures and store them in your system, treating them as files for the sake of uploading is a different matter.
It's kind of like the difference between an iPod for storing music under its own system format (at least the old ones), and a portable music player that uses a generic "drive" for its music data (like my old H-140). You can't get the music off the iPod except with special programs, whereas you can just copy files directly from the generic file system.
Maybe see if there is a different browser (some suggested iCab?) or app you can use, or maybe you'll have to jailbreak the pad to do that.