Here is the ICS file content:
BEGIN:VCALENDAR PRODID:-//Test//Test 1.0//EN VERSION:2.0 CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VTIMEZONE TZID:Asia/Tokyo X-LIC-LOCATION:Asia/Tokyo END:VTIMEZONE BEGIN:VEVENT DTSTAMP;TZID=Asia/Tokyo:20190108T154626 UID:a0K1I000007ljAxUAI-a0D1I000007daO4UAI RELATED-TO:a0K1I000007ljAxUAI DTSTART;TZID=Asia/Tokyo:20190123T080000 DTEND;TZID=Asia/Tokyo:20190123T200000 SUMMARY:XXXXXXXXXXXXXXXXXXXX2 LOCATION:XXXXXXXXXXXXXXXXXXXX2 DESCRIPTION:XXXXXXXXXXXXXXXXXXXX2 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTAMP;TZID=Asia/Tokyo:20190108T154626 UID:a0K1I000007ljAxUAI-a0D1I000007daNzUAI RELATED-TO:a0K1I000007ljAxUAI DTSTART;TZID=Asia/Tokyo:20190110T080000 DTEND;TZID=Asia/Tokyo:20190110T200000 SUMMARY:XXXXXXXXXXXXXXXXXXXX1 LOCATION:XXXXXXXXXXXXXXXXXXXX1 DESCRIPTION:XXXXXXXXXXXXXXXXXXXX1 TRANSP:OPAQUE END:VEVENT END:VCALENDAR
In Thunderbird and Gmail I able to see only first (by order) event. Is this normal behaviour for mail clients, should I create separate .ics file for each VEVENT then and send it with single mail? Thanks in advance for help!