Save or rename a recording in QuickTime Player on Mac
QuickTime Player gives recordings a placeholder name, such as Untitled, and saves them to a default location. You can give a recording a new name and save it to a different location on your Mac or in iCloud.
In the QuickTime Player app on your Mac, choose File > Save.
Enter a name in the Export As field, add a tag (optional), then choose where you want to save the recording file.
To save your recording to iCloud, click the Where pop-up menu, then choose QuickTime Player — iCloud. See Store files in iCloud Drive.
To rename a recording, open it, click the name at the top of the window, then enter a new name.