uploads via http/php are limited by 2 settings in your php.ini file (assuming UNIX, I'm sure its the same in Windoze though). By default, max_post_size and max_upload_size are 2M. Increase them to a value you want but also realize that this consumes extra memory and *could* later be used for some random exploit or DoS. None exist that I know of that affect the current versions but potentially someone could attempt to repeatedly post 8MB strings and chew up all your available RAM and swap a lot faster since they use 8MB blocks.
but again, no such evil exists...today.
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