Hi, I need help with inserting a moving image or video behind the items that's in the collection. What I mean, when user clicks on the certain collection (ex. t-shirts) I want to show the t-shirts avaible and behind them will be the moving image/vide...

Well, how do I do it? 

Hello, I would like to put my own picture behind the items on each collection. Could you help me how to edit my template to do so? And also behind, each product, when you click on it. I use Dawn theme.