Hello. There are many other posts in the forum about this. If you search you will see what some other users have done.
For very large files, once you are connected with S3 you will need to break them up, but I would suggest focusing on the connection and successful upload first then you can work on what to do with larger files. It will be easier to test with smaller as you are beginning.
Here’s one forum post about it and I saw others when I searched using the search bar on the forum pages