Solve an FTP ownership issue

The owner "site1xxx" (e.g. site1152, site1163, site1184…) appears when the FTP user account that created the folders/files in question has been removed from the list of FTP user accounts.

To access these files again in order to modify them, you need to log in with a different FTP account in the FTP File Manager and change the owner of the files with the "Properties" button.