Display a "Please wait" message after submitting forms?

I have a form that allows users to submit up to 6 images that become part of a custom post type. When they submit the form, it can take a while (depending on the quantity and size of images) for the form submission to complete and the confirmation page to display.

Is there a way to show a spinning beach ball or similar GIF with a “please wait” message until the form submission is successful and the confirmation page is displayed?

There are a couple filters that allow you to control the spinner when processing a form action. You could potentially use this in combination with some custom CSS to overlay the image on the current page in a more modal fashion. Not sure how you might display text as part of that though, unless maybe it’s baked into the image.

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