Invite others to collaborate in Keynote on Mac

Keynote

If you don’t want all participants to be able to invite others, deselect “Allow others to invite.”

Choose a method for sending the invitation to collaborate (if the presentation isn’t stored in iCloud Drive, you’re prompted to move it there):

Mail or Messages: Type an email address or phone number for each recipient, add a note if you want, then click Send (for Mail) or press Enter (for Messages). A link to the file is sent to each recipient.
Notes: To share a link to the file in the Notes app, select or type the name of the recipients, click Share Link, choose the note where you want to save it (or create a new one), add text if you want, then click Save.
Invite with Link: Copy the file’s link, so you can send it or post it using any internet service that’s already set up on your Mac. Type an email address or phone number for each recipient, then click Copy Link. Open the app you want to use to share the link, click where you want to paste the link, then choose Edit > Paste (from the Edit menu at the top of your screen), or press Command-V on the keyboard.

Important: The link to the presentation that’s created when you invite participants includes the presentation’s title. If the title or content of the presentation is confidential, be sure to ask recipients not to forward the link to anyone else.

After you share a presentation, a checkmark appears on the Collaboration button Change a shared presentation’s settings in Keynote on MacStop sharing a presentation in Keynote on Mac

Keynote User Guide for Mac