URLs

In Movie Collector, it has the provision to attach a picture from a scene of a particular episode, as seen in the first image below. However, as things are, all of those images are ones on the Colletorz website, and it is hit and miss whether a particular series or even a particular season within the series has them available.

The ideal solution would be to create an archive on my computer, and point the program toward it, but to do that, I would need a URL that would point locally, rather than online. For clarity, at the bottom of the second image, it can be seen where this URL goes, but not the form needed to make it work...does someone understand the problem and have an answer?

Thanks, that gives me something to work with, but I'm still wondering if it is likely to work, because those schemes appear to be for online use with a browser, rather than a local piece of software and archive. I guess that the only way to know if it will work is to try it, but what are the odds?