Any media on your canvas can be customized to fit your vision for your creation.
Layering from the Action Panel:
Select any media item on your canvas. Look at the Action Panel and notice the two Layering Buttons, 'To Front,' and 'To Back.' As suggested, To Front sends the media item to the front, so everything else will appear to be behind it; meanwhile To Back sends the media item to the back, so any other item will appear to be in front of it.
Layering from the Item Panel:
Use the item panel all the way to the right. Select the media item you wish to adjust the layering for. Click/Tap and hold and drag it above or below the other items. Above means it will be in front and below means it will be behind.