Files in dropbox are stored as .gdoc when created with google docs, .gsheet when created with google sheets, .gslides when created with google slides, .paper when created with dropbox paper and finally, .papert when created from paper templates. but they are stored as plain text files in linux desktop. please add the file type support for .gdoc, .gsheet, .gslides, .paper & .papert in dropbox for Linux OS and add icons for the file types.
1. These are the icons I recommend for .gdoc, .gsheet and .gslides files:-
Finally, move these xml files to /usr/share/mime/packages.
3. Update the mime database with the command " sudo update-mime-database /usr/share/mime " in terminal and the dev team, please add support for opening these file types in dropbox through firefox or any default os browser like in windows and mac.