By default, phpmyadmin has a max upload size of 50 Mbn. In order to increase upload size follow these steps on WHM server:
- Login to WHM as root
- Go to Server Configuration » Tweak Settings
- Click on PHP tab
- Update the values `max upload size` and `max POST size` to the max file size you need. (Values higher than 2047MB are not permitted for max post size.)
- Don’t forget to update `max execution time` to a proper value (in seconds) according to your upload speed to avoid getting the upload process fails if it takes longer than the value already set in `max execution time`.