orudge

Microsoft Store:

https://docs.microsoft.com/en-gb/windows/uwp/publish/app-screenshots-and-images

Screenshots - up to 10, 1366 x 768 or later, up to 4K, PNG format

Store logos:
- 9:16 poster art (720x1080 or 1440x2160), highly recommended, PNG
- 1:1 box art (1080x1080 or 2160x2160), recommended for "best display", PNG