I've created an online form with an attachment file upload option, but after testing it; it doesn't work. It says "Invalid file type RC=2" as the error message. I don't know if it is a php setting or a joomla setting, or something I did wrong on community surveys. Does anyone have any ideas? All I want is for the user to be able to submit a .pdf, .jpg, .png, .ai, or.eps file.