We have an ability to create Triggers on Cloud files, but not files on MS Sharepoint sites.
Why it's important? Because MS Onedrive sharing is not widely supported as maintenance is complicated/relies on a single person being able to fix connections should it change or expire.

Not directly related to this request, but why Cloud types connections do not include Sharepoint connections? Switching from one to another is timely process involving a creation of new task while if it was Cloud type, could just swich Connection inside of task.