I am using embedded form in website. I have changed the code a bit to align and have the same language and theme on my webpage. I also made the mandatory fields "Last Name" and "Email" hidden but I set their values before submitting the form with correct data (already tested them and created a ticket)

I have a problem only when attaching files. See below:

1) Clicking Attach files (blue text in above image) does not work, nothing happens when clicked.

2) When manually showing one of the attachment hidden controls from browser inspect using the method below:

I get this error:

Looking forward to your support,