Multipart upload process verification

In another forum, I was advised to use Process Explorer in Sysinternals Suite by Microsoft to see how many processes are running for a given parent/child relationship. It shows that I'm only running one aws_pc_backup process. I configured it to run 6, which I start running in aws_pc_backup, so I expected to see 6 children of aws_pc_backup. Did I do something wrong? I coded aws_copy_backups to call aws_pc_backup and aws_pc_backup starts the upload process using a config with 6 processes. I code this in python using the boto3 utility. Is there something I'm missing here?

Here's the screen print of that Process Explorer screen:

I did some more research and I'm using the client upload_file method to upload to s3. In one area it mentions that a config can be provided, but in another area it doesn't mention config at all. Which is the case?

Did mention it here: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3.html No mention here: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3-uploading-files.html

By the way, I did double check. I do, of course, have threads=True in my code.

I will create an issue in GitHub under boto3 for this.

i submitted an issue on this in github.

https://github.com/boto/boto3/issues/3445