Be aware, the AWS S3 ListBuckets API call only lists the OWNERS buckets, it does not list buckets that you are not the owner of, but have full permissions.
In CloudBerry Explorer, to view bucket you have "access" to, but are not the owner, you must type the bucket name in the explorer path.
Also CloudBerry Explorer gives me an error (with PowerScale S3) when I upload an object.
The error is "The given key was not present in the dictionary", which I am assuming is an api call to tag the object?
But PowerScale does not support S3 tags.
If you refresh the panel, you will see the object did succesfully upload