Error: Max filesize limit 2MB
Grav, as many other PHP-based softwares, relies on PHP settings. In order to fix this, you need to have access to your php.ini conf files onto the server. The server probably has many php.ini files. Steps to fix:
/admin/config/info
CTRL+F to find a string,
our config looks like that
look at
Loaded Configuration File /etc/php/8.0/fpm/php.ini
on the server, edit that php.ini file and raise the limit, e.g. to 20M
$ sudo vi /etc/php/8.0/fpm/php.ini
then restart the webserver
$sudo service nginx restart
or, in case fpm service is in use, the fpm service
$ sudo service php8.0-fpm restart