Add interstitial ads in a Coloring Book Unity game

hi, i have a Coloring book Unity game i want to do some modifications on it:

- i want interstitial ads to appear every time the user clicks on a photo

- I don't want the privacy pop-up to show up when the user opens the app for the first time, i want it to show up only when the user clicks on the privacy policy button

- when the user clicks on save or no I want an interstitial to appear before can go to the home page (this pop-up appears when the user clicks on the home button)

- when the user clicks on save I want him to go back to the home page and before that i want an interstitial to appear (this pop-up appears when the user clicks on the share button)

please watch the video to understand and also try the app this is the link of the apk : https://drive.google.com/file/d/1hfGq7dSbr7VnKQoKHcxZdvZd1ZQqMVWw/view?usp=share_link

Thanks!