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Do I have to copy all files with the same folder structure to Package project? Or, is there a way I can configure for VS to handle those (even sync when changed)?
It seems that you are trying to package your UWP app using the Windows Application Package Project, right? If it is, then you don't need to move the Assets from the UWP app. Actually, the Windows Application Package Project is just a container and a bridge, it does not affect how the UWP app uses its own resources like the Assets folder, it connects the UWP app and other desktop apps that you package together. The UWP app will still use the resources in its own Assets folder if you want to display images and do other actions. When you need to change resources in the Assets folder, just do it in the UWP app as you did before.
Update:
So your issue is about the App Icons and tile images. That's excepted. What you need to do is just generate the logo icons again like what you did in UWP apps. Find the image you used in your UWP app, and generate other icons in the Windows Application Package Project. Then you should be able to see the splash screen and the app icon.
Thank you.
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