Upload Form: Invalid extension error

Please screen shot below:

There is an error from upload form while uploading:

Also the link to our dropbox seems to be failing over the last few days.

Here is a link to webpage:

http://www.thecadgroup.ie/cad-print-bureau-upload-and-send-files.asp

Thank you for reporting the issue. The issue should be fixed now. We would appreciate it if you could also test it on your side and let us know the result. We will wait for your response.

This is the the test on my side.

~This is urgent and we need it fixed please....

Are you still able to reproduce the error on your end? If possible please share a screenshot with us.

How to include screenshot image in the support forum

I have checked your embedded form in different browsers, but I was not able to reproduce the issue.

We produced the error on last screen shot under the upload file blue button.

However overnight all seems to be fixed but could you give me a reason as to why this might have happened.

We are sorry that you had troubles with using your form. The upload field was updated by our developer team. Your issue might be related to this update. We hope this issue won't recur again.

Please contact us again if you experience any other issues.

Thanks for your understanding.

Regards.