Hello johntc,
We thank you for your inquiry and apologize for the delay in our response.
We are making every effort to alleviate any concerns. Dedicated tech support is now available to the team to answer emails.
to answer your concern, export is through .ics file only, which may need to be recreated from time to time.Then copy the exported .ics and add it your calendar.
Also, please be aware that the team is currently working on an upgrade that will address many of the integration problems and will be released within the next several days. We apologize once more for the trouble this has brought you.
Please let us know if there is anything else we could help with.
Best regards,
Niel, Input WP support team