When user creates a CAB Meeting record and sends a notification to all the attendees with images in the notification body, email is sent to the respective attendees, however the email received doesn't contain the images
The cause of this issue is the Type of notification being sent. The notification in question is of type - Meeting Invitation. The emails sent out from the notification of type Meeting Invitation are of icalender formatted emails.
In current design Servicenow doesn't support HTML content in Meeting invitations / icalender formatted emails.
Since it is not supported in current design, customers will need to raise enhancement requests so that the requirement may get considered in future releases