If you want to add attachments to the agenda, click the "Edit agenda" button.
Attachments can be attached to the agenda under "Attachments". Click or drag and drop files to upload attachments. When you are done with the agenda, click the "Mark agenda as done" button to send the invitation to the meeting participants.
Write a message about the updated agenda. Click on the "Attach Agenda as PDF" box to attach a PDF version of the agenda to the notice, along with documents attached to the agenda. Finish by clicking the "Send invitations" button.