Shared File Management...Which do you use?

For anyone on a small or mid-sized real estate team/organization that manages/owns/develops multiple properties (15+), how do you store all the property-specific documentation?

Editing access is essential because I do not want anyone just going in and editing, removing, or uploading documents. Google Drive 'Viewer' access does not allow for someone to upload documents which isn't ideal. How do you get around this and who is usually in charge of uploading all pertinent documents? What type of documents are usually getting filed as well? 

If anyone can share which platform you (Dropbox, Google Drive etc.) your filing categories for each property, and how nuanced it gets would be appreicated.