You many need to add more values to PHP settings available under PHP Selector options in cPanel. The following steps are needed.
Modify /etc/cl.selector/php.conf and search for post_max_size and change the default if desired and add values desired to the RANGE line for example change
Range = 2M,4M,8M,16M,32M,64M,128M
to adding 1G
Range = 2M,4M,8M,16M,32M,64M,128M,1G
The same can be done for upload_max_filesize and memory_limit as well.
After saving the file with the desired changes run the following
and now the adjustment will be seen in cPanel under PHP Selector.