To install the Capsule Gmail Add-on for your individual Gmail account follow this guide. If you’re a G Suite admin you may be looking our article on how to install the add-on for all users on your G Suite domain.
Click on the + icon in the sidebar to Get add-ons
In the marketplace dialogue that appears, search for Capsule.
Click through to the Capsule Gmail Add-on listing and hit Install.
You will need be prompted to pick a Gmail account you want to authorize the add-on to use.
Click the account, then click Allow.
Now you’re ready to get started.