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To my understanding you are having an issue attaching files through the file upload field on your jotform.
If I am not mistaken I believe you are having this issue with this jotform here http://www.jotform.us/form/51114391820143 that I found on your account.
I tested this on my end in the latest version of Chrome and it is working properly. I am able to attache files without any issues. I noticed you appear to be using FireFox so according to our Data for your Browser info so I tested that too and it worked as well.
The first thing I would highly recommend is for you to clear your browser cache.
If none of that helps and you still continue to have this problem then please answer these questions I have listed below for us so that we can check on this issue more.
Please confirm with us what browser you are using that you are experiencing this issue in?
What version is your browser?
What OS and OS Version do you have?
What is the file size and file type you were attempting to upload?
Are you attaching this from an embedded form or are you using the jotform link?
Also, are you trying this from a computer or are you using a mobile device?