Hi Philip,
Thanks for getting in touch! Great question–the ICS files that are exported from The Events Calendar are static files that can be imported into any application that supports them, but they do not establish a link between the two sites. That is to say, no syncing or other modification of events is supported by simply importing an ICS file. Does this answer your question? Let me know if I can clarify anything further! You can read more about our ICS export functionality here on our Knowledgebase.
I hope that helps! Thanks again, and let me know if there’s anything else I can do to assist! 🙂