Admittedly I’ve not worked with forms with uploads on Webflow, but clicking the link for me reveals:
{"msg":"You are not currently logged in","code":401,"name":"Unauthorized","path":"/api/sites/wideryd-casting/formUploads/53be17c7-4ad0-402d-91c7-c70c6e63b6ce.jpeg","err":"Unauthorized: You are not currently logged in"}
Have you tried checking this in an incognito window, or logged out maybe?