Use workflow extensions in Final Cut Pro

You can use extensions to access features of third-party apps from within Final Cut Pro. For example, you can access stock footage, media management, and review-and-approve apps without ever leaving Final Cut Pro.

To install an extension for Final Cut Pro, follow the instructions that came with the extension app.
Open Final Cut Pro.
Click the Extensions button on the left side of the Final Cut Pro toolbar.
Note: The Extensions button appears only when extensions are installed.
The extension window or a menu of installed extensions appears.
See the documentation that came with extension app for instructions on how to use it. For example, you might drag items from the extension window to an event in the Libraries sidebar or to a project in the timeline.
To close the extension window, click the Extensions button.

To uninstall an extension, remove it from the Applications folder and reopen Final Cut Pro.

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Final Cut Pro User Guide

Use workflow extensions in Final Cut Pro