An .ics file will not be imported.
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The file is 370 kB but it is not possible to import it into Vivaldi calendar. The upload takes a long time and when the upload window disappears, the window where you entered the data remains open.
I have previously imported 3 other .ics files where the import worked. -
Okay, just now, on what felt like 55'th try, the upload worked.
