We have our bucket with new Aws SDK API on AWS S3. We uploaded and tagged lots of files and folders with tags.
How can we filter on key-value tag, or only one of them?
There seems to be one way to achieve what you're looking for, although it's not ideal, or particularly user-friendly.
The AWS S3 tagging documentation says that you can grant accounts permissions for objects with a given tag. If you created a new account with the right permissions then you could probably get the filtered list.
Not particularly useful on an ongoing basis, though.