Screencastify requires at least 1 GB of free disk space to work properly, even if you save your recordings on Google Drive. This is because the upload to Google Drive happens after the recording has been completed, so Screencastify needs some disk space to temporarily store your recordings.
In order to protect your recording from being corrupted, Screencastify will automatically pause your recording if disk space is dangerously low. It is possible to turn off this feature, though we recommend proceeding with caution.
TIP: See the links below for instructions on how to free up space on your computer.