iOS 15.2.1 - Cannot open .ics file attachment in any app,

Hello,

Apple does not let me open an .ics file attachment received in a non-Apple Mail client app.

The Share function does not list any calendar app (e.g. Apple Calendar, Google Calendar, etc.)

A question about this issue was also asked in previous thread but remains unresolved.

Previously, a community user suggested the file might be corrupted. If so, the corruption issue is related to the app. In this case the email client is ProtonMail.

Nonetheless, the only workaround is for me to forward the email from the non-Apple Mail app to Apple Mail.

Thanks