Background image not rendering

Hello,

I have been unsuccessful so far in rendering a background image in my signwriter profile.

My image is a JPG stored in my sites/sitename/files directory.
I have tried the path as:

• filename.jpg
• files/filename.jpg
• sites/sitename/files/filename.jpg

The end result is my text rendered on a black background. An example has been attached.

My background JPG is a standard web-formatted JPG: rgb, 72dpi.

What am I doing wrong?

Thanks!