transparency in the render

The attachment file is an arrow with transparency made ​​with GIMP. I can import it and work with both Synfig and my video editor (iMovie). However, I do not know if I can do the same with Synfig, ie, draw a picture (or animation) and in the render, transparency is maintained. Is that possible?
flecha transparente.png

You only can keep transparency if the target output supports transparency. In Synfig’s case only image sequence supports transparency if the image type does support it (png, gif, tiff). As far as I know none of the output video formats Synfig supports handle transparency.