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Problem: Image upload in front end Cred not working
Solution: There is an error in the browser console: /wp-content/plugins/cred-frontend-editor/application/submit.php?id=19168&formid=9057&nonce=9f8bf3feb0 403 ()
This error means that there should be a resource that is not accessible for some reason. it may be a file permission or some configuration on the server.
For this specific case, the client had a .htaccess that prevented accessing the submit.php file which was fixed by removing the .htaccess file
Relevant Documentation: https://www.lifewire.com/403-forbidden-error-explained-2617989