Synfig importing SVG is not that good, and sometimes may not work.
So I recommend you to install Inkscape and then save the file as .sif (Synfig animation file). Even if this cause any issue then you can
- Open file in Inkscape
- Cut all the contents
- Paste in place (Ctrl + Alt + V)
- And then try saving the file as .sif (Synfig Animation) from the Save As option.
Hopefully, this guide will be helpful, Figma exports SVG files optimized so that SVG files are not too large. This is good as well as bad, hopefully, Inkscape supports everything.
Also, development on SVG importer in Synfig is going on, features for writing importer and exporter in Pythons is also in progress, so we can export better import/export support in future.