An .ics attachment in Proton mail should easily lead to an event in Proton Calendar
When I have received an e-mail in Proton Mail with an .ics attachment I should be able with one click on that attachment to import/save it in Proton Calendar. Now I can only download that attachment (tried in windows app, android app and browser).
This seems to me a very logical function!

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Richard commented
It would be nice if the imported .ics file process had, during import, appended a tag to each imported event, to allow in the search process the ability to select, mass move or delete multiple events in one go.
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Murteza commented
This was on their roadmap for 2024-2025 winter and has been implemented very early on after the announcement. Both Android Proton Mail app and web mail client do support importing ICS attachments to Proton Calendar as events. This request is already implemented.
If you are getting ICS file which cannot be imported, make sure that it is not in a zip file, or contain incorrect format.
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commented
Is it not easy? I just drag and drop the ics file in.