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PnP PowerShell - Installing and publishing apps on the site collection app catalog
It seems like https://docs.microsoft.com/en-us/powershell/module/sharepoint-pnp/install-pnpapp?view=sharepoint-ps and https://docs.microsoft.com/en-us/powershell/module/sharepoint-pnp/publish-pnpapp?...
Accoring to the article below "ALM APIs are not currently supported for the https://docs.microsoft.com/en-us/sharepoint/dev/general-development/site-collection-app-catalog. Support will be added in early 2018"
https://docs.microsoft.com/en-us/sharepoint/dev/apis/alm-api-for-spfx-add-ins
"Early 2018" has almost passed if you ask me, but I guess we have to wait a little longer...
It seems like the following is working for adding and deploying to the site collection app catalog now:
connect-pnponline <url to site collection with app catalog>
Add-PnPApp -Path <path to sppkg file> -scope Site -Overwrite -Publish
Regards Leif