David Kimura PRO said almost 2 years ago on Active Storage Uploads Behind a CDN :
Also, try adding this to the CORS Configuration within the S3 Bucket

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">

After a few minutes, if you find this working, you can then start narrowing down the CORS rules if needed.