Save or rename a recording
You can specify a title for the recording and save it to a different location on your Mac or to iCloud. QuickTime Player gives files a placeholder name, such as Untitled, and saves them to a default location.
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. For more information about working with files in iCloud, see Store your desktop and documents in iCloud Drive.
To rename a recording, open it, click the name at the top of the window, then enter a new name.