Let's say our SharePoint 2013 online url is
Is it possible to add a subsite (like an application under IIS website) that launches a SharePoint app?
I created a sample SharePoint 2013 app in Visual Studio and deployed it to SharePoint online, and got a long isolated url like
I'm wondering if the app can be accessed under the same root domain as shown in the picture below, something like
If this is not possible, how are users supposed to access the app? Like the developer provides the isolated domain link to the app in a page?
And how do I set the master page of the app page to the master page being used on SharePoint online?