I'm trying to build a SharePoint app part to include in a SharePoint online page allong with other web parts.
I'm using SharePoint online developer to deploy the solution I'm developing in visual studio community 2017.
The app works in its custom link, but when I insert the app part in a page, is doesn't work, I'm getting a JavaScript error saying it can't load content from external domain... I already included allowframing tag in the master page without success, is this because I'm In the developer SharePoint or is it another problem?
Thank you