Favorite Documents Outside of Delve
In Classic SharePoint, users can Follow documents from any document library to have their followed files display in OneDrive.
However, Modern's closest tool, Delve Favorites, only allows for favoriting a file when you are working within Delve or Delve's version of Search. This greatly limits the functionality of Delve's Boards and favorited documents, as it is tedious to find the files for a given board - particularly files like PDFs that are not edited using Microsoft applications and thus don't appear in recents.
Please add the ability to follow files from within a document library.