Install SPFx App
Download the SPFx App package site-admin.sppkg file from the latest release.
This solution is recommended to be in a single location in the tenant for everyone to use. We have two options for installing a solution for the tenant and a single site collection. If you install the app in the tenant app catalog, then it will be made available for anyone to install it within the tenant. To restrict this, you can install choose to install it to a site collection app catalog. Below will be the instructions for both options.
The first step is to create the app catalog in the site you want to install the solution to. I've provided both examples for completing this in PowerShell, based on your SharePoint PowerShell library preference. You can reference this link for Microsoft's documentation on configuring an app catalog.
# Connect to the admin site
Connect-SPOService -Url https://tenant-admin.sharepoint.com
# Create the app catalog
Add-SPOSiteCollectionAppCatalog -Site https://tenant.sharepoint.com/sites/helpdesk# Connect to the admin site
Connect-PnPOnline -Url https://tenant-admin.sharepoint.com -UseWebLogin
# Create the app catalog
Add-PnPSiteCollectionAppCatalog -Site https://tenant.sharepoint.com/sites/helpdeskAccess the site's app catalog we just created. Based on the above example, it would be https://tenant.sharepoint.com/sites/helpdesk/appcatalog. Click on the Upload button and select the site-admin.sppkg SPFx package file.
Once you upload the application, a window to enable it will be displayed. Since we are installing it to a single site collection, select the Make this solution available to all sites option and then the Deploy button.
From the SharePoint Admin Center, select More Features and then click on the Open button under the Apps feature.
Click on the Upload button and select the site-admin.sppkg SPFx package file.
We do not want to make the application available to all site collections, so we will select the option to Only enable this app, then click on the Enable app button to complete the request.
Access the target site's Site Contents page to install the solution on. Select New and then click on App.
Find the Site Admin tool app, and click on Add to install it to the site.
