Trouble saving animation

HI. I’m new to Synfig and working my way through tutorials etc. I’ve started my first animation. I can save the project but am unable to successfully export as avi, mpeg, mp4 or gif. After a lengthy rendering, I get a file, which opens, but doesn’t run as an animation. I tried running synfig from the command line, (Windows 10) but I get the error message that synfig is not a recognized command.
Do I need set up synfig as an environmental variable/path? If I have to I guess I can render the individual frames as pngs (that part works) and manually run ffmpeg. But it would be nice to do a 1-step export. Thanks.

I found this Help Rendering
Creating and saving to c:/temp folder worked.