Adding Custom Background To All Pages?

Store Builder Questions
1

When I go to design>Themes>Visual Editor>Background there is only an option for adding patterns but when I try to add the image I want, that does not work.

2

Been looking around in settings, still have not found a way =(

3

[quote name='parodius420' timestamp='1396683008' post='181031']

Been looking around in settings, still have not found a way =(

[/quote]

What size is the image that you are trying to upload for the backround



Alan