Upload field displays, accepts attachment, BUT...

Upload field displays, accepts attachment, BUT...

A colleague shared his Zoho computer lab reservation system with me - which allows teachers to sign themselves up for the computer lab on a certain day/classperiod. It also requires them to attach lesson plans/seating charts.

He also had a modified form within this application which allowed teachers to sign up for mobile equipment. It appears that the lesson plan / seating chart fields were hidden - but when the user tries to make a reservation, they are given and error message since they didn't attach the appropriate documentation.

I figured out how to show the fields - but now - even when attaching the files - users are given an error message saying the file isn't present. I don't know where to look to "fix" the code.

Any advice?