[itafroma]

> Can I create a folder for each client then send a link that will allow them to upload documents to their folder?

Yes, as long as they have their own Dropbox account (free version's fine for this purpose). You can otherwise share read-only access to folders with anyone.

[snomad]

Yeah, but for write access you have to add everyone to the folder, which is unfortunate.

With Google Drive, you can give write access with just a link.

Recently, my organization did an open feedback forum. We wanted everyone to be able to add comments via DropBox, but their was no easy way to add a random list of 50+ people. Ended up switching to Google Driver as a result.