How to manage third party files in replicable EC2 instance?

I have a file from a library with size > 50MB so I cannot deploy it with Git in my instances. I include this file in some of my PHP scripts, so what should I do in order to leave my instance replicable and include this file in my scripts?

I can store it in a S3 bucket but im not sure if that's a good practice (including external files).