Hi, I'm mariano from argentina, I can do the job for you. It is a really simple task. I can do it quickly.
The highest resolution that you have the videos are the one in YouTube? It would be better to have them in High Res to work in After Effects.
Which format do you need them to be delivered? or just uploaded to YouTube or any other website?
Good luck and let me know if you can use my services. I'm new to "freelancers" but I have been working for many years.