Unable to import ics file to calendars on iPad, iPhone, or iCloud

My ipad and iphone are running ios 26.1. There dosn't seem to be a way to add an ics file in an email to the calendars on the ipad or the iphone or icloud on my pc. Is there a way?

[Re-Titled by Moderator]

Original Title: I Can't import an ics file to my calendars on ipad, iphone or icloud on pc.