How to add attachments on the Create appointment page:
Click on Add attachments below Attachments.
Select one or several files.
In order to remove an attachment, click the Delete icon .
Tip: You can also add an attachment by dragging and dropping a document from a file browser or from the desktop to the appointments window.
Also see
Creating new appointments
The Calendar view for creating or editing
Using the date picker
Setting recurring appointments
Adding participants or resources to an appointment
Setting an appointment's display
Parent topic: Creating Appointments