To increase the PHPMyAdmin upload limitation in Cpanel servers you can edit the php.ini file mentioned below :
upload_max_filesize = 100M post_max_size = 100M
Even if you edit the main php.ini file it won’t work in this case.
Cpanel >> PHPMyAdmin may not reflect the change.
If so log in to your WHM as a root user
Go to Tweak Settings under the server configuration section
Then select the PHP tab
Then you can increase the upload limit to your required value for cPanel PHP max upload size
Then, click Save.
After this process, phpMyAdmin will display the new maximum upload file size on the import screen next to the upload button.