Import .ICS file into IOs Agenda app

I like to import an .ics file into the IOS Agenda app. It doesnt recognise it as een Agenda file.

Apple, I switched to Iphone because of the User Experience,

But a simple task like this seems impossible.

I tried:

1 - email myself with .ics file as attachent to op it from there, it doesnt recognise it.

2- share it from files, there is no agenda app to share to

3 - Drag it from the files into the calender app. DOESNT WORK.

Now, Im forced to put in all the appointment manually. This should not happen!

I think going back to android, Maybe I will buy the Xiaomi 17 Pro Max