Having an issue where I cannot submit a previously saved custom (multi page) form.
Going through the 6 page form in one go is straightforward and works.
Now if I pick up on a previously saved incomplete form, get to the last page - it simply will not submit and it's not a Captcha issue either as no error message appears there.
However, a generic validation error message happens at the top of the page saying there is something wrong - and asks me to look for the error. Which does not come up on the last page or any of the previous pages.
The form has a required upload field on page 4 - not sure if this is causing issues, but it appears to be attached when resuming an incomplete form.
Have done this type of form last year when we had Squiz v4.18.4 and managed to get it working. Is there something different about the way it's supposed to be setup in v5.3.1?