Adding a SharePoint Framework Webpart to appcatalog that is not on a devleoper tenant

Recently we Inmates had trouble adding a SP FrameWork WP to our app catalog. The app package is not valid and there is no “Trust this app” popup when trying to add app package file.

We decided to drop SharePoint Framework webparts for now ( to bad since they are totally awsome ! ) and rather focus on getting things done 😛

We belive it is possible to fix this issue if you enable the developer site coll feature with PowerShell by following the guide here: