How to implement user image selection in app for windows phone 8.1?

Question

Windows phone

I'm trying to write an application for text recognition for windows phone 8.1 (I have no experience in developing for mobile devices).
however, in the course of development, a lot of completely stupid questions arise that are difficult to find answers to.
Here is one of them:
In order for the program to recognize the image, you need to provide the user with the opportunity to find the image on the phone and select it for further loading into the application.
How to do it?

Answer 1

Servelat: https://msdn.microsoft.com/en-us/jj556296.aspx See
XAML selection tasks: www.codeproject.com/Tips/804006/Browse-Photo-in-Wi...