Open picture from gallery

Hello, how do I open a picture from my phone gallery to show it in unity ?

I’m developing an android application for a friend. He must take a picture of the flower and then write his name, his Latin name and some characteristics on the flower. I would also like him to be able to add a picture of this flower, but I don’t know how to open the gallery and select an image

Thank you in advance

https://github.com/yasirkula/UnityNativeGallery