MacOS Mojave Screen Recording and CloudApp
I didn’t realize that MacOS Mojave had unified screenshot/screen recording functionality, and bound it to a keyboard shortcut Shift-Command-5.
Except when I tried it all I got was the usual screenshot cursor, with none of the options detailed in that support post. After trying a few related shortcuts it dawned on me that CloudApp was hijacking the default keyboard shortcut. Quitting CloudApp/reassigning the shortcut then uncovered the default MacOS behavior.