If you need to make the Teams Add-On functionality available to all your Teams, proceed with the Tenant App Catalog Installation; if you want to restrict usage to a subset of your Teams, proceed with the Site Collection App Catalog Installation.

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Install Web Parts on Tenant App Catalog

To add our Teams Add-on, you'll have to upload the Web Part package to the Tenant App Catalog. To do this, follow the steps below:

1. Open the Office 365 app launcher and click on Admin;

   

2. Open your SharePoint Admin Center;

   

3. On the left panel, click on More features and select Apps;

   

4. Proceed by clicking on App Catalog;

5. On the left pane, click on Apps for SharePoint;

   

6. Now click on Upload and select the .sppkg file that's inside the spfx folder in your web part package.

   

7. Finally, on the pop up that appears, tick the checkbox Make this solution available to all sites in the organization and click Deploy;

   

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Install Web Parts on Site Collection App Catalog

To add our Teams Add-on, you'll have to upload the Web Part package to the Site Collection App Catalog. To do this, follow the steps below:

1. Open the Site Collection you wish to deploy the product to;

2. Click on Settings and navigate to your Site Contents;

3. Open your Apps for SharePoint list;

   Note: If you're unable to see the Apps for SharePoint list, this means that you do not have a Site Collection App Catalog created. To do so, follow the steps described in the following article.

4. On the left pane, click on Apps for SharePoint;

   

5. Now click on Upload and select the .sppkg file that's inside the spfx folder in your web part package.

   

6. Finally, on the pop up that appears, tick the checkbox Make this solution available to all sites in the organization and click Deploy;