How to upload files to websites on an ipad

Download iCab Mobile for iPad

In the app where you made the file you wish to upload, tap the button that gives you the 'Open In...' box - it's usually the Share button - then choose iCab Mobile to add the file to its local storage

You will be taken to iCab Mobile - browse to the website you want to use, and tap the 'Select File' button or its equivalent - iCab will list the files stored locally - select the file

Tap the 'Upload' button (or equivalent)

The file should upload!