Make sure to open the document in the corresponding application (Word, Excel, Acrobat, etc.). Then on the Zoom call, click on the green share icon, which will give a screen of options for sharing. Amongst the options should be your currently open document. Click on the document, and it will share only that item to members of the meeting.
To stop sharing, click on the red stop sharing option near the top of the Zoom meeting window. Below is a tutorial video for a visual example
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The host can open manage participants and select mute all under the participant's list or click more on a selected participant and click mute. For step by step instructions, please see this support article.
If you have joined by adding the meeting ID (the number at the end of the link) into the Zoom desktop client or the browser version of Zoom, you'll not have this issue. Also, if you're teaching a zoom class via Canvas, you need to click start on the Zoom tab for the meeting you wish to host/join.
Please contact us either by emailing: help@iq.harvard.edu or calling our Help desk # (617) 495-4734 and we will contact the HUIT Zoom Admin to fix this issue for you on the server-side, and then after the meeting can figure out what might have caused this issue.
Select Manage Participants from the toolbar in the bottom
Select on the right Tool bar under the Participants section, Select “More” button
