Hi Victor,
I have occasionally done what your trying to achieve in a couple of projects but with limited success depending on the complexity of the SVG.
You have to open the SVG in a vector application and select all the elements and copy and paste them on to the Saola canvas.
I asked about this a while back and Atomi’s reply was useful for my vector software - Paste vector graphics as freeform shapes
I can highly recommend Saola Animate having used it for years now but if your serious about using external SVGs, I’d invest in some decent vector software where you can split them up and import parts into Saola for animation.