In the past I did a PR for this API. Using this as a reference....

1. What is the native API like in Android, iOS, and UWP ?

When I implemented I did not make use of the native APIs, to ensure that the implementation was similar on all platforms.

2. Do we need to make the method async?

Yes, because in all 3 platforms we use async methods. To get the byte[] or to save the sreenshot image.

3. What should this return? byte[] or the filename?
The both. Like this:

 public static Task<string> CaptureAsync(ScreenOutputType type = ScreenOutputType.PNG, string fileName = null) =>
            PlataformCaptureAsync(type, fileName);
         public static Task<byte[]> GetImageBytesAsync(ScreenOutputType type = ScreenOutputType.PNG) =>
            PlataformGetImageBytesAsync(type);

The developer can use the byte[] when he wants to do some other image processing, such as sending to a service. And we go back the path, when developer just wants to save the image on the device.

What format of image can this be which all platforms support?
On all 3 platforms, we can convert the image to .png or .jpg .

Screenshot API #125

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