Unable to upload files

my clients cannot upload any files on form, it show error all time, please check.

I checked the last edited form https://www.jotform.com/83384429063461 and I didn't find a File Upload field. 

Please provide the form URL so we can try to replicate the issue. To find the form URL, please follow this guide: https://www.jotform.com/help/401-Where-to-Find-My-Form-URL

https://form.jotform.me/83472724643461

https://form.jotform.me/83302915328455

https://form.jotform.me/83303455071450

Please check

I checked all the forms and tried to upload the image and it works fine on my end. However, can you tell us where your clients have experienced the problem? we will try to clone the problem.

Also, could you please let us know if we can send a test submission on the form to try it out from our end?

We'll wait for your reply. :)