Please note Phomemo is not compatible with Chromebook because Chromebook doesn't allow third-party software / drivers to be installed.
If you connect Phomemo to a Mac or PC, you may then share it with your Chromebook via Google Cloud.
Please see this How-To link on sharing your Phomemo from Mac / PC with Chromebook:
Note: This video was not made by Phomemo. However, it contains the correct installation steps.