When uploading files via ftp, by the user ftp_usr, how can I force proftp to change the owner and group for the file to test: test?

Question

linux

The question is the following.
There is Apache which works with the mpm-itk module.
There is a project that runs under its own user and group, let's call them test: test
Accordingly, the owner and group of the project root directory are recursively set to test: test.
There is a folder in the root of the site, let's call it ftp.
Also created is the user ftp_usr, whose home directory points to this folder.
Task.
When uploading files via ftp, by user ftp_usr, force proftp to change the owner and group for the file to test:test.
I know that there are 2 directives GroupOwner and UserOwner, but for some reason only GroupOwner works, but does not want to change the user.

Answer 1

Mode.
Turn on

<IfModule mod_cap.c>
   CapabilitiesEngine on
   CapabilitiesSet +CAP_CHOWN
</IfModule>

For directory

UserOwner test
   GroupOwner test
   Umask 002 003

Works for me.