Ability to have folders of documents under a contact file. Also the ability to rename files, saves having to download file > change name > re upload file
I say documents I think they should remove the name "document and contracts" to "proposals & contracts" as documents would be something different.
Ie. immigration adviser/lawyer has lots of client documents, visas, birth certs, school certs, medical clearance, etc etc these have to be named correctly for the application process and it would be easy to sort these files with folders.