How do I add a file to Moodle which is greater than 100MB?

The maximum file size Moodle currently supports is 100MB.

If you have a file greater than 100mb, the best platform to use at this time would be Google Drive. You would upload the file there and then share that link with your instructor. Here are instructions on uploading a file to Google drive:

https://support.google.com/drive/answer/2424368

Here are instructions on sharing a file from Google drive:
https://support.google.com/drive/answer/2494822

If your instructor* has given you a text area, you should be able to paste the ‘Share’ link there. If your instructor has only provided a file upload area, you could put the link in a document or text file of some sort.

*The best course of action is to first check with your instructor to see how they would prefer to receive this type of file.