Exchange works perfectly when product files are stored on my server, but I get an error when storing them on Amazon S3:
'Download Error: Invalid response: 403'
I pasted in the full URL of the S3 file per the instructions -- is there anything I need to do, such as tweak the permissions on the bucket, or is there a setting I missed somewhere?
I'm really hoping this is another dumb user error on my part . . . .