Help adding a background image to brooklyn theme

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I would like to ask you something. I tried to upload a background JPG using this on my brooklyn theme:Cattura3.png

Instead of "page", I decided to select "product" and after that I changed the template from the "product editor".

It shows up the background on my  preview but when I refresh the actual website as a visitor it doesnt work.  Do you know why and how can I fix this?

Another question, I would like to upload different pictures for mobile and destkop. Can I do it? How?

Thanks for the help :)