I have two user/computer network (business owner and assistant) and like to use Microsoft One Drive so that all of their files are stored in the cloud and two users can access them 24x7. Some files are confidential, so the owner like to keep those files from Assistant. That is pretty much what they need. They have email addresses provided by their franchise headquarters - like firstname.lastname@example.org. Both computer has Microsoft Office 2016 installed and I think they paid for the license once. In other words, it is not subscription based.
I understand that OneDrive for Business per user is $5 / month.
Would they need to get two licenses (or one) to share files and folders?
Can the owner of business create folders in OneDrive and make some folders accessible by his assistant, but make some folders only accessible by himself?