OX: Appointments with attachment. Wrong URL in Thunderbird (CalDAV)

Hi@all,

when I create an appointment with attachment in OX (7.10 / UCS 5.0.3) in the web UI the path in OX (open appointment → attachment → view is displayed as follows:

https://gw.domain.club/appsuite/ui#!!&app=io.ox/calendar&folder=cal://0/31&perspective=week:week

If I look at the appointment in Thunderbird the URL is displayed like this:

https://gw.domain.club/attachments/MS0zMS0xMDk1LTI/Rotwein.png

When I click on the link shown by TB, I only get:

Not Found
The requested URL was not found on this server.
Apache/2.4.38 (Univention) Server at gw.domain.club Port 443

Does anyone have a tip what this is?

with best
sven

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