Validation : help required - still no joy!

I have a test form at https://daviesandgray.co.uk/bookings3.php which works fine as far as entering data, sending as an email etc. My problem is validation.

I can validate fields such as Email which works fine.

Where I am failing is with both the Dropzone and reCaptcha elements.

The App Structure shows the Validation Rules

The Server Actions Steps shows the server-side Validation Rules
Also note the lack of symbols and misalignment of the word images

And you can see from this screenshot that the upload is in progress BUT the total file size is well in excess of the 1.5Mb, the reCaptcha is not ticked, and there are infact seven images selected (validation is set to a max of 4 images). None of these checks have worked. The progress bar continues to the end but the form is NOT submitted. No errors are given on the page.

What am I not doing?

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