How do I allow the Documents library in an Office 365 Group site allow ASPX pages to be viewed?

It appears that I can upload ASPX files to Documents library in a regular SharePoint site and it will render.  If I do the same to a Documents library in a SharePoint Site that was created as part of an Office 365 Group, the ASPX file will not render, but will be downloaded instead.

 

More details can be found here: https://sharepoint.stackexchange.com/questions/237928/how-do-i-allow-the-documents-library-in-an-office-365-group-site-allow-aspx-page