The maximum size of a file that can be uploaded to the server using the FIle Manager depends on Plesk PHP settings.
To set the maximum size of a file that can be uploaded:
/usr/local/psa/admin/conf/php.ini
file for editing.post_max_size
and upload_max_filesize
directives to the desired maximum file upload size./etc/init.d/psa restart
command.Note that the changes are server-wide and will affect both the provider and all customers.