Use: Displayed on the details page for your application in Google
Play.
You may upload up to 8 screenshots each for phone, 7” tablet and
10” tablet.
Specs: Minimum dimension: 320 pixels. Maximum dimension: 3840 pixels.
The maximum dimension of your screenshot cannot be more than twice as
long as the minimum dimension. You may use 24 bit PNG or JPEG image
(no alpha). Full bleed, no border in art.
We recommend adding screenshots of your app running on a 7" and 10"
tablet. Go to ‘Store listing’ page in your Developer Console to add
tablet apps screenshots.