Can I make a document storage?

Hi, I'm new to web development and Grav but would like use Grav as an internal site for managing and sharing information within our network. Thus I'd like to ask if it's possible to allow permitted users to upload documents (.pdf, .xlsx, .docx etc) for everyone to view/download documents?

Yes this is possible. Grav already understands most document types, and you can add more via the media configuration: https://learn.getgrav.org/content/media#supported-media-files