Sometimes tech support has modified the php.ini file but no increase yet.

As far as I know, php.ini affects the Apache implementation of PHP, not the implementation of PHP that phpMyAdmin runs on when in cPanel and WHM.

You should need to login server via SSH

and open a file /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini and search “increase upload limit” then change the value and save the file.

The PHPMYADIN limit value will change it.