We have the following folder structure:
Folder A
------------Folder A.1
------------Folder A.2
------------Document A.1
I want UserA to be able to see Folder A.2 but nothing else in that folder. So I share Folder A.2 to UserA and using the link in the resulting email they can see the contents of that folder. However if they browse to the SharePoint site they can't see Folder A to then get to Folder A.2. What have I not done?!
Microsoft say this is just the case, you need to keep the email notification for the link or bookmark it: https://community.office365.com/en-us/f/154/p/443958/1135803#1135803
You need to configure permission inheritance.
On the subfolder name, do the following:
To view the folder’s Permissions page, click Advanced.
Edit the permissions of those in the current list by selecting the check boxes and clicking either Edit User Permissions or Remove User Permissions.
Click Grant Permissions and fill out the dialog box. Make sure you click Show options and select the appropriate permission level for the user