Ignore permission error seems not working

Environment: WinSCP 5.17.10 running on windows 10

We use WinSCP to have more users working on a shared directory on a Linux server. All users belong to the same Linux group but we need to set WinSCP set rwxrwx--- permissions to a new file copied on server so that another user of the same group can work on it.
If an other user try to overwrite the same file I have the usual 'operation not permitted error' even if I have the ignore permission error checkbox enabled.
In any case the file is correctly overwritten but, after try a lot of solution found here and there I start to suspect the Ignore ... is ignored.

Available to send additional info and logs (if someone tells me where to find it)

Luca

Please attach a full session log file showing the problem (using the latest version of WinSCP).

Thanks for the quick response, logfile in attachment

The "Ignore permission errors" is supported with the SFTP protocol only:
https://winscp.net/eng/docs/ui_transfer_custom#upload

Instead, turn off "Set permissions".

Unfortunately turn off set permission will be an issue due to server configuration (umask). Any chance to have it working also with scp protocol?
Asking just in case...

Thanks

I do not follow. If you need to set the file permissions, why are you trying to set "Ignore permission errors"?

Your server does not seem to be able to set file permissions. If you need to set the permissions, you need to fix your server. No settings on WinSCP side can fix that. Or are you able to set the permissions using any other SCP client?