If you are pasting in the code workaround from above, take care that you might end up with the wrong type of quote marks. Check your code editor when you paste in or simply type in the code by hand to be sure.
add_filter( ‘wpcf7_load_js’, ‘__return_false’ );
However, can confirm it does “fix” the issue in my instance, though the page now reloads itself, which is a shame as the success prompt is then too low down by default. We added a redirection plugin to send the visitor to a thank you page on form submission.
As the others above have said, this seems to happen when a file upload field is added to a form (if removed, the form is fine) and only on mobile, as the same form works ok on desktop.
