Back to animating individual frames for Cosmos. Cutting each image down to a frame or two is tedious as all hell, but I can cheat it by cropping them to a few seconds each, then running the whole clip in fast motion. Nuance and rhythm is lost, but it gives be a basic idea of what all these frames might look like when animated.
Here’s another method if I’m understanding your process correctly:
Go to the Final Cut Pro pull down menu, select User Preferences then click the Editing tab. Adjust Still/Freeze Duration to your liking. This will set the length for any new stills dragged into the timeline.