To increase the max upload file size of a php / wordpress page, do the following :

1: Open the file manager

2: Navigate to public_html

3: Open / create a file called .htacess (hidden files must be enable via the top right gear settings icon)

4: Add the following lines to the bottom of the file :

php_value upload_max_filesize XM
php_value post_max_size XM
php_value max_execution_time 300
php_value max_input_time 300

X = the amount you need. (120 should be more than sufficient in most cases)

5: Save and close the file

6: Retry upload

This is a simple solution that works on most php related plugins / uploads.