Making movies from your SAS® Graphics files gets complicated quickly. It helps to think of it as creating a movie from an “ANIMATED GIF” made from a collection of .GIF files in a SAS Catalog. I recommend sticking to one format, file size, and suffix until you are comfortable with processing reports that show your simulations.

Thanks to Karen Walker for this tip. Read more details in this paper from WUSS 2017: Cell Growth Simulation using SAS.