@Alon1 I was just poking around in the upload settings when I noticed enable s3 inventory. I’ve never used that feature, but from the description…
Generate reports and verify uploads using Amazon S3 inventory. IMPORTANT: requires valid S3 credentials (both access key id & secret access key).
…and I thought of your directory of files. Another path to research, in case the S3 logs are not the ones described in the linked docs. 