By default, Asset Bank does not display Folders that do not have any assets assigned (are empty). This is to allow Admin users to create new folder structures without distracting users with Folders that are yet to be assigned assets, in other words, keep your Asset Bank tidy.
Your users will still be able to locate 'empty' Folder on Upload (should they be assignable) and Folders will become visible once there are assets assigned to them.
If you wish to make 'empty' folders visible to all users by default then please contact support.
If the Folders have assets assigned and your users still cannot view them then please double-check their Folder Permissions or contact our support team and include the name of the user and folder that is not visible.