To increase the upload file size limit in phpMyAdmin running on the Plesk / CentOS 7 server you need to modify the  /usr/local/psa/admin/conf/php.ini configuration file:

• Set post_max_size = 64M (or whatever limit you want to set)
• Set upload_max_filesize = 64M (or whatever limit you want to set)
• Reboot the server.

November 2023
phpMyAdmin
Plesk
CentOS 7