Applies to - QuarkXPress , InDesign
Background : This issue occurs when a user tries to upload content other than HTML 5 through Add Content button on the App Studio Portal. The Add Content button is designed for creating the HTML 5 Content directly in App Studio.
Please refer the below link for steps to upload a QuarkXPress Document on the App Studio portal.
In case you are an InDesign user, please follow the below link :
In case of any further query, please contact the Quark Technical Support.