I've developed SharePoint Add-in (SharePoint hosted) with an app part so it can be added to SharePoint page. The problem I'm facing now is that the app part is not available from App part (or Web part) gallery so a user can't add it into a page in SharePoint Online. Microsoft made it clear that only Add-in installed with web scope (as opposed to tenant scope) will be available in App Part gallery. Unfortunately, I wasn't able to figure out how to install it with web scope. There are no instructions or How-To around. Am I missing something here? Does anyone know what needs to be done to make an app part available on SharePoint host site?
Any help would be much appreciated.