Users must install and authorize an add-on before they can open and use it. Since these steps are the first part of the add-on user experience, you should understand them before you start creating your own add-ons.
This documentation section describes how users can install, authorize and start using G Suite add-ons.
Before you can use an add-on, you must install it. Once installed, the add-on becomes available in the G Suite host application it extends.
You can install published add-ons from the G Suite host application or from the G Suite Marketplace. Domain adminsistrators can also install add-ons on behalf of their users from the G Suite Marketplace. You can also install unpublished add-ons you're developing so that you can test them. Before you can use an installed add-on for first time, you must authorize it.
For more details, see Installing add-ons.
After installing an add-on, it becomes available in the G Suite host application it extends. The first time a user attempts to use the add-on the host application presents them with an authorization card or dialog. This card explains what the add-on needs permission to do for the user, such as accessing the content of the current Google Sheet. The user can then grant those permissions and allow the add-on to proceed. If the user denies the add-on authorization, they can't use add-on.
Editor add-ons use an authorization model that differs from G Suite add-ons. Because editor add-ons operate on Google Drive files, the editor authorization model defines various authorization modes that result when add-ons are used with individual files. When developing editor add-ons, it's important to understand the different modes and how an add-on moves between them.
For more details, see Authorization.
Once you have installed and authorized an add-on, it is available for you to access and use in the host application it extends.
G Suite add-ons present an icon representing the add-on in the host application's desktop or mobile UI; users can start or dismiss the add-on by clicking this icon.
Editor add-ons usually present at least one menu option in the editor's Add-ons menu that lets users start using the add-on.
For more details, see Starting add-ons.