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Event Description formatting does not support direct linking to Google Drive documents.
Example “https://docs.google.com/document/d/.../edit?usp=drive_link” which points to a Google Doc file causes the Event Description to break. As a workaround you can link to the Google Folder the document is stored. I hope this helps and please let us if there is any plans to support direct linking to files in Google Drive.
Google Drive gives you short links (works with IA) for Forms, but when it comes to sharing files directly, it only has “Copy link” in the Share menu. Are you using a third-party link shortener?