No email notification when sharing from drive

[leriak]

I'm having trouble with email notifications for shared files in Drive.

Testing setup (DSM7, latest synology drive package installed)

• An admin user
  • without email setup in personal area, but with system email notifications enabled and working (through mailjet)
  • in file station cannot right click on a file and "send as email attachment" as the email is not setup in personal area
  • in synology drive settings-general the notify me with email and chat boxes are clicked
• A normal user
  • with email setup (gmail account) in personal area, email shows on synology drive settings
  • in file station can right click on a file and "send as email attachment" and it sends the file, so the email integration is working
  • in synology drive settings-general the notify me with email and chat boxes are clicked

Notifications test

• From admin account everythins seems to work even though no email has been setup:
  • Share a file with normal user
    • Notification on appears on chat and webapp
    • Email is received
  • Uses system email setting for sending email (weird ¿?)
• From user account
  • Share file with admin user
    • Notification on appears on chat and webapp
    • No email is sent (email does not appear on "sent" on gmail) and obviously no email received

I've seen this on the kb, but does not seem to apply to this situation...

Email | DSM - Synology Knowledge Center

Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.

kb.synology.com

Any thoughts? Am I missing something or is this some kind of bug?