Every object on your page is placed in order relative to the other objects on the page. The last added object is at the top of the stack.
If you need to move a photo, text frame, shape or decorationt up or down that stack so it appears on top or underneath other objects on your canvas, use the Order feature to move the position of your photo.
Select one or more items on your canvas, then click on the Order option at the top of the page.
Bring Forward or Send Backwards moves the selected photo one step per click.
Bring to Front and Send to Back pushes the selected photo to the very front or very back of the stack.