I just saw this when I came on RCTGO:

Can not upload file - Too large for php post_max_size directive. Please press the back button.

WTF

if the problem lies i size
resize and try

and if it is due 2 more memory
change it in any other file
like JPEG,etc

if thr is still problem
try both

dats all i could say

no this was on RCTgo's index page.