Set permissions before upload or automatically afterwards

To whom it may concern,

Your software is great, but I am having one problem. I would like VERY much to be able to set permissions for my HUGE files before I upload them to a server or during the upload or automatically change permissions for it somehow once uploaded. Is this possible?
Maybe I could set permissions for the parent file that applies to all the ones inside it???

Thanks!

P.S. I'm relatively new, so I'm sorry if the solution is obvious.

See Set permissions option in transfer settings:
https://winscp.net/eng/docs/ui_transfer_custom

When I check "Set permissions" and select that option under the transfer settings dropdown, I see the following message and it doesn't work as intended:
"All configured transfer settings cannot be used in current con..." (I can't see the rest)
Might it have something to do with R ACL and W ACL being checked for "Owner"??

Please post few screenshots for the "All configured transfer settings cannot be used in current con..." and a session log file of the "it doesn't work as intended".

Like I said earlier, I'm new and need help. How do I get the session logs? I attached a picture the issue.

Enable session logging in preferences:
https://winscp.net/eng/docs/ui_pref_logging

Thank you so much for helping me. I saw you've been replying to forum posts since before 2006! I turned on server logging, performed the issue I'm having, and attached it.

OK, you are using S3 protocol. You never mentioned that.
WinSCP does not support setting S3 ACL during upload.
It supports only changing permissions of existing (already uploaded) files explicitly:
https://winscp.net/eng/docs/ui_permissions#s3_acl