No need to write a manual variables for shortcode. Create a shortcode for gallery or uploader just by clicking a button within a page or post editor.Look at the video below:

Version 1.1.4, December 24, 2018
New Features- New custom gutenberg block for rtMedia Uploader and Gallery shortcode[ Doc ]
- New icon for shortcode generator popup
- Added admin selection for Per Page Media attribute under Gallery shortcode generator
- Improved Album list view with Group and Profile albums
- Minor bugs
Version 1.1.3, July 25, 2018
Enhancements- Added album selection in Gallery section under shortcode generator admin pop-up
- Added Default Albums with personal album list in Uploader section under shortcode generator admin pop-up
- Issue with displaying media title when Media Title option is set to Show
Version 1.1.2, January 22, 2018
Enhancements- Improved update plugin script
- Added Docs link directly in plugin screen
==Version 1.1.1==Jun 06, 2016
- Updated German language file
- Updated EDD License library
- Added GPLv2 or Later License explicitly
- Added language files
- Initial release
- Provided shortcode generator button in post and page editor