If you are using Zoom for MacOS, on a device updated to Apple's Big Sur operating system, as well as leveraging a wired connection for your internet, it is possible you may experience a black screen when attempting to share content with others in a meeting or webinar. On macOS Big Sur, packets over a certain size may not be transmitted properly over the UDP protocol.
While the fix for this issue is coming in the next MacOS update by Apple, we recommend leveraging a wireless connection in the meantime. If you require a wired connection for your device, you can change your Zoom screen share settings to use a TCP connection.
- Sign in to the Zoom desktop client.
- Click your profile picture, then click Settings.
- Click the Share Screen tab.
- Click Advanced.
- Check Use TCP connection for screen sharing.