premium

Unfortunately, there is no documentation for Gmedia plugin. Use forum if you have any qustions: https://codeasily.com/community/forum/gmedia-gallery-wordpress-plugin/
Plugin is free, but if you need some custom premium module you can buy license key to use them without backlink label. All premium modules are free to test and full functional with backlink label.

Get license key here: https://codeasily.com/product/one-site-license/