Adding an SVG, Ai or PSD file doesn’t work. Ai and PSD says it’s not learned to open yet. SVG file is just a blank group layer with nothing in it. Help?
Unfortunately, AI and PSD files are not supported as of now. They take a lot of workaround. They are also proprietary formats.
Second, if you want to use SVG format, you have to import it into Inkscape and then export as SIF file (Synfig’s own file format). And it will work fine.