# Start screen sharing when Zoom client or another app is already sharing

**URL:** <https://devforum.zoom.us/t/start-screen-sharing-when-zoom-client-or-another-app-is-already-sharing/54891>\
**Category:** macOS\
**Created:** [July 28, 2021, 10:27pm UTC](https://devforum.zoom.us/t/start-screen-sharing-when-zoom-client-or-another-app-is-already-sharing/54891 "2021-07-28T22:27:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![santhoshr048](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/santhoshr048/32/21588_2.png) [@santhoshr048](https://devforum.zoom.us/u/santhoshr048)\
**Post date:** [July 28, 2021, 10:27pm UTC](https://devforum.zoom.us/t/start-screen-sharing-when-zoom-client-or-another-app-is-already-sharing/54891/1 "2021-07-28T22:27:11Z")

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I have an app that uses Zoom macOS SDK and it is able to start meetings and share the screen when running by itself. However when I’m in a meeting and sharing screen in Zoom client, I’m able to start a meeting in my app but not share the screen. It works fine when using Zoom’s meeting UI - screen sharing stops in the Zoom client and starts in the app, but when using custom meeting UI, I just get an error when trying to start screen sharing programmatically.

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**Author:** ![jon.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jon.zoom/32/13495_2.png) [@jon.zoom](https://devforum.zoom.us/u/jon.zoom)\
**Post date:** [July 29, 2021, 5:38pm UTC](https://devforum.zoom.us/t/start-screen-sharing-when-zoom-client-or-another-app-is-already-sharing/54891/2 "2021-07-29T17:38:48Z")

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Hi @santhoshr048, thanks for the post.

Unfortunately this is not yet supported when using a custom UI. We plan on adding this in a future release, so be sure to keep an eye on our [release notes](https://marketplace.zoom.us/docs/sdk/native-sdks/macos/release-notes). 🙂

Thanks!

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [August 29, 2021, 3:39am UTC](https://devforum.zoom.us/t/start-screen-sharing-when-zoom-client-or-another-app-is-already-sharing/54891/3 "2021-08-29T03:39:18Z")

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Closed on August 29, 2021, 3:39am UTC

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