Apple today seeded the third beta of upcoming an upcoming macOS 15 Sequoia update to developers for testing purposes, with the software coming two weeks after the release of the second beta, which added iPhone Mirroring support.
Registered developers can opt-in to the beta through the Software Update section of the System Settings app. Note that an Apple ID associated with an Apple Developer account is required to get the beta.
macOS Sequoia includes iPhone Mirroring, which allows you to control your locked iPhone from your Mac. You can open and use iPhone apps, interact with notifications, and drag and drop files between your iPhone and Mac and vice versa.
Read more at MacRumors.com