How Access FileOpenPicker with appium unitest [C#]

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Hi,

I’m creating a UnitTest for my UWP App using appium. When the user clicks a button a FileOpenPicker will appear. How can I control the FileOpenPicker? I want to select a file and confirm the FileOpenPicker Dialog.

   var ButtonPlusElement = AppSession.FindElementByAccessibilityId("ButtonFilePicker");
    Assert.IsNotNull(ButtonPlusElement);
    _ButtonFilePicker = ButtonPlusElement;
    _ButtonFilePicker.Click(); //FileOpenPicker  appears

Thanks.