Need to scale up a project to export to mp4
Finished a large project last night, only to discover the project settings were entirely wrong for exporting to mp4. I had made my document 800x450, thinking I could increase the size right before export. I've now changed the property settings on the doc to 1920x1080, clicked the scale to content box, but so far, all I've been able to achieve is my original 800x450 animation on a stage that's 1920x1080. What am I missing?

