Replace the WordPress theme gallery with a gallery plugin (update)

Hello, For this project, you will have to replace the theme gallery of my WordPress Website with a more professional gallery plugin that I already bought. 1) You will have to modify the WordPress theme backend to allow me to paste directly the shortcode generated by the plugin for each "Item" page (an "Item" is a special "Post", it is something specific to this theme). 2) You will have to adapt the plugin to the theme (height, width, background color...). Regarding the plugin gallery, it is very similar to the actual gallery, but you have to manage CSS to make its look as close possible. 3) You will have to send me a text file including full instructions of changes that you made in the WordPress theme, so I can reproduce the changes later when a new update of the theme will be released. I will choose the winning candidate based on a number of factors including project cost, availability and previous experience. Have a nice day!