I tried a couple of things: S3Browse, the RightAws Ruby gem and other tools. All allow granting access on an individual key basis, but I wasn't able to set the ACL on buckets. Actually, I set the ACL on the bucket, no errors are returned. But when I refresh or check in another tool, the bucket's ACL is reset to owner only.
I want to give read and write access to FlixCloud for an application I'm developing. They need the access to write the output files.
The tools you're using require sharing your secret key with a 3rd party web site. Which is highly insecure. Apart from the fact that they just don't work ;)
Why not use S3fm?
Online, secure, convenient. Runs directly from Amazon S3 - no need to share your secret keys with anyone.
I have just double checked that for you - S3fm was able to change the ACL successfully. I used their email [email protected] as userid. You can see the user in the list afterwords as flixclouds3.
Yup, just checked it again after 10 min. ACL remains as configured. I guess this is something at your end then. Try different account/workstation.
Check out CloudBerry Explorer freeware. It allows you to set ACL for all files in the buckets. Besides, you can configure your bucket to apply its ACL to newly copied files