I know this idea has been posted previously. Being able to organize Files & Folders several different ways using Color Coded Tags would be a MAGNIFICENT improvement of PROTON DRIVE.
By using tags, and the ability to use SEVERAL tags on each File and Folder, Proton Drive would become a magnificent, user friendly file storage system.

I would amend previous suggestions by stressing the importance of being able to:
1) Use several Tags on each File or Folder
2) Color Code the tags
3) Choose Custom Made Colors in addition to standard Colors, which is something that ProtonMail also could use
4) Combine Tags in Groups, thus quickly and easily setting up a customized access to Files & Folders, thus making Files & Folders easily accessible for certain specific Project one is working on. Such Groups could then be deleted after a Project is ended, without messing up the original Tags.
5) Combine Shapes and Colors on Tags, thus expanding greatly the ways Tags could be used to distinguish Files & Folders from each other.