License Agreement Background

Hello,

i hope iam right here, because i have a little problem.

I tryed to implement a background into the License Agreements via HTML.
and i used this code for example:

This solution works great! But is there any way to implement the background file directly in Setup Factory, just for the case i will shut down my webserver ;)

I mean, i can move files into the archiv, but all of them want a destination, is there any way to put the destination on "local use" and i can use this file like:

Thanks for the help and best regards
Chris