ERROR ITMS-90680: "Invalid directory. The bundle (...)StickerPackExtension.appex is not contained in a correctly named directory. It should be under "PlugIns".

Using XCode 10.2.1

Submitting my first stickers app for iOS for testing.

When uploading archive to itunesconnect I'm now getting this error:

ERROR ITMS-90680: "Invalid directory. The bundle Payload/App Name.app/App Name StickerPackExtension.appex is not contained in a correctly named directory. It should be under "PlugIns".

My project structure is now:

App Name
   - Stickers.xcstickers
   - Products
      - App Name.app
      - App Name StickerPackExtension.appex

I don't see any way to move .appex to a PlugIns folder (non existing) as the error suggests.

Additionally the project structure is the default structure I'm getting when creating "Sticker Pack App"in Xcode.

So I'm not sure why is the process complaining about the .appex being in a wrong directory and I have no idea how to fix this to proceed further.

Any help appreciated!