- Unable to install or update plugin via Plesk:
Warning: The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions. "sdk_files/plesktest.php"
/var/www/vhosts/example.com/httpdocs/wp-content/plugins/plugin_name/sdk_files/plesktest.phpis empty and has root ownership and group.
plesktest.php has incorrect permissions.
Login to the server via SSH and remove plesktest.php file:
# rm /var/www/vhosts/example.com/httpdocs/wp-content/plugins/plugin_name/sdk_files/plesktest.php