Watch App Review & Sales Questions

Apple has two watch app cases below.

  1. Watch App Only
  2. Phone App + Watch App (uncheck supports running without ios app installation option)

I am trying to distribute it in the second situation above, "phone app + watch app". We are currently developing/researching a watch app. So, I have a few questions.

First case:

Documents can only be viewed on the watch app. You cannot view documents in the phone app, but it converts and transfers files from the phone app to the watch app. You can view the file by opening it in the watch app. Can a case like this pass the app review?

Second case:

In phone app + watch app, when both apps have the ability to view files Is it possible to sell the phone app and the watch app separately for a fee?