Upload form stopped working - with 400 error

A simple upload form using dropzone was working correctly previously has now stopped. I would have done a few wappler updates since I last tested it, so can’t say if it was due to an update which one.
I made no changes to the page.

If the file is not added to the form, the server connect form action runs to completion
getting a 400 error. type xhr
error points to serverconnectForm.js:302

Spent a few hours troubleshooting and I’m still stuck. Hoping it’s a simple fix.

Please follow: Debugging Server Connect Errors for the exact error message.

I did this and simply get 400 Bad Request (openresty).
I checked the server for any type of errors there and don’t see anything either.

Please post a screenshot of the exact error from the XHR tab of the dev tools of your browser as explained in the docs.

Here are screenshots. Debug mode is also on as per recommendation.

Maybe enable the detailed error reporting on your server so we can see the exact error message.

It turned out to be the server firewall for the app. Reconfiguring it solved the issue, there was no errors what so ever and whats strange is that it wasn’t changed since inception. Will look into it further thanks for you assistance as always.