Okay, so, that SVG file isn't working because it simply contains a raster/bitmap image. It's only vector data that works with the uploader, which isn't the same as a PNG. If you have a bigger version of the original image, maybe post it in the Request thread and someone may create it as a vector file for you.
Just to be clear, pasting an image into inkscape doesn't make a vector file, even though you're then saving it as an SVG file.