Notify Shared Users
You
can also keep in touch with your shared users regarding your
presentation.
(Who knows, you might well end up with a club of your
own...
)
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Click on Share button in the top nav. Or use the arrow beside and click on Notify Shared Users.

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Enter your message and its subject.

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If you wish to receive a copy of the mail, use the relevant check box.
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Click on Send Mail button.
No, you don’t have to copy-paste email IDs. Zoho Show takes care of that little detail too...