Notifications about folder activity for emails who are not collaborators in the folder.

Use case: Our end users are not allowed to access cloud data sites on our corporate network per compliance regulations thus them not being added as a collaborators. I sync the folders down to our file servers and share them creating a two-way data sync between our end users and their clients who use the website. I’ve just been asked to supply alerts when a client performs activities in shared folders but can’t do so directly because I can’t add specific email addresses to the alerts.