Is there a limit to how large a video file can be?

No, there is no limit to how large a file can be.

There are a lot of variables in that answer, like if you are doing this from a 4K file be sure to provide multi-bitrates so that more of your viewers can watch.

We also recommend doing FTP as your upload method for files at 2GB in size or over.

If you need help to upload via FTP on the new Back Office, please follow this tutorial.