You can create a gallery by tags. This functionality can be extremely helpful to save your time, eliminating the need to move multiple files between multiple folders.
FWG Tags add-on enables tags functionality on your website. It allows managing tags in Tags administration section, showing tags in category files grid and single files and create categories by just defining tags. Tag categories will show all files across all website that have defined tags in category settings.
If FWG File Meta Data is installed, tags will be imported from uploaded files meta data automatically.