hmm so what i understand you want to bot uploading files, first you need to get security holes that will make you able to upload then upload a shell like c99 or others then upload what ever you like but why you want uploading much files? you want ddos the site? if you want it i would say that's is a perfect idea but its need much work be side if you hacked site why you want to take it down? man its yours miss up with index lol btw there is alwayse a poor security uploading sites , just search about photos uploading the upload files like bot but there is a limit so you have to find a poor security site or hack one