We would like to set the function when user click the image or set the button to download the right hand side big image, the big image base on Gallery2 section. can have easy way to set only download image 3 base on gallery2 ?

We would like to set the function when user click the image or set the button to download the right hand side big image, the big image base on Gallery2 section. can have easy way to set only download image 3 base on gallery2 ?
you can try:
Image3.OnSelect = Download(Gallery2.Selected.AbsoluteUri)
if that does not work, i dont know any other way to do that in powerapps