Backups to S3: Backups are running. bkp files are not visible in S3 browser

I am running fast compression backups and running them to an S3 bucket, standard storage class.

The backups are applying AES-256 compression.

When the maintenance plan runs, new S3 folders are created for any databases that do not have an existing folder.

When the job completes, I do not see the database files in the S3 browser.  Nor do I see them in the AWS UI... the folders appear empty and taking up no storage.

But if I attempt to do a restore in the litespeed console I am able to browse to the S3 folder and select the backup file.

How is it that Litespeed is able to see files in the S3 bucket folder but the files are not visible in the S3 browser, or the AWS UI?

Thanks,