Is your feature request related to a problem? Please describe.
I find myself messing around in the workspace quite often.
I had a time where I had bunch of already uploaded documents, and my task was to tag each one of them by their file extension.

Describe the solution you'd like
add new button(s) for tagging (or removing tags from) selected documents.

Describe alternatives you've considered
I couldn't think of any alternatives :(

Additional context
some screenshots concepts? here is.

random idea 1

random idea 2

1. add tag.

• tags the document if such tag does not exist;
• does nothing if tag already exists.

2. delete tag.

• deletes the tag if such one exists;
• does nothing if there no such tag.