I am a reasonable novice to After Effects but managed to create a animation of a 'travel route path on a map'. I used a jpeg file off the web and created the route path. It works well but I can get it to size correctly in the timeline on playback in Premeire Pro. Have tried 'Fit to Scale' but no luck, I am sure as usual it will be something simple I have not done or doing. Have attached the screenshot from After Effects and Premiere Pro.
I apologise for not getting back earlier but have been away for a week on a work task. I have attached screenshots of what I hope you asked for. The two are from Premeire Pro and the third is from the original project in After Effects. When I looked at it, I think I can see the issue, as the size of the jpeg map is 736 x 628 (1) which I assume is only one frame.
Your map looks square also, so if you are working with a small project in AE and then using it in PP you'll have to scale it up as your PP is a typical HD 1080p sequence. You'll have some space on the sides of your map in an HD sequence.
When you look for a map like that, be sure to find one in a size you can use without too much scaling (done in AE most likely). Also, maps in SVG format are good also.