Upload your saved image.
Create Sketch1 and insert the image using the "Insert Image" tool.
Center it with the origin and then dimension it
Accept Sketch1 and create Sketch2
Trace the image in Sketch2
Hide and show Sketch1 to check your progress
Periodically during your tracing, click the Green Check to confirm the sketch and save your sketch. If you exit or disconnect without ever doing so, your work will not be recoverable.
This video will walk you through the steps listed above.