Google & YouTube

Your new Google Shopping app, unlike the old one (no longer supported) has some holes in it.
Products in my feed do have GTINs
Error Message I'm getting is: "Barcode gtin missing: gtin is required for this product".
Issues:
1. GTIN numbers are are transferred to Google Shopping campaigns
2. There is no way to enter (re-enter) GTIN in a window "Edit Google Shopping fields", GTIN field MUST be added to that window PLEASE. That field is missing.

Currently Google REQUIRES BOTH: MPN number AND GTIN or a product will be rejected.

Is someone still working on improvements to your Google Shopping App, or should I resort to other paid apps.

I say: Do not install !!!
The old app was working OK.
There should be a way to choose between the two.