Share your presentation
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Select Share on the ribbon.
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Enter the names or email addresses of the people you want to share with.
Or select the drop-down to change permissions. Allow editing is checked by default. To change permission to view only, uncheck this box and select Apply.
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Include a message if you'd like and select Send.
You can also select Get a link to create a link that you can copy into an email.
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Co-author a presentation
After you share your file, you can work together at the same time.
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Under Share, see who is also working in the file.
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Colored flags show where each person is editing.
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Comments in presentations
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Select Review > New Comment. Or select New if the Comments pane is open.
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In the Comments pane, type your message in the box and press Enter.
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Select Reply and type your response.
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Select the Next or Back buttons to go between comments and slides.
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Select the X in the upper corner of the comment.
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Chat while editing
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If there's another person editing your file, select their image or initials in the upper right corner to open a chat window.
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Type some text and press Enter.
Note: Your conversations won't be saved when you close a file.
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Version history
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Select File > Info > Version history.
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In the Version history pane, select a version to open and view it in a separate window.
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