Adding an attachment such as an image or link can be done while creating an alert, poll, or form.
Important Note:
Adding the attachment as a link in the body of the message is recommended so the attachment is accessible to the public link, email, and app notifications (if applicable).
Instructions
In the Message section, select the Link icon
Select Browse Server
Upload a new file or choose a file already in the system
Click Submit
Make any adjustments to the Display Text
Click OK
The link to the attachment will show in the body of the message