Accept a Sharing Request
When someone invites you to share a PowerPoint presentation, you will be asked to Accept the sharing request.

What Do You See? There may be a notification in the bottom right corner. In this example, Clair is adding data sharing. There should be another alert in the Group Conversation.

3. Try It: Accept a Sharing Request
Click on Accept sharing request.

Keep going...

Your Lync->Group Conversation->Share->PowerPoint Presentation