Upgrading to Kubuntu 20.04 with KDEConnect 1.4 resolves this problem.
** Changed in: kdeconnect (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1860796
Title
This feature was introduced in Kdeconnect 1.4 but Kubuntu has frozen at version
1.3.5.
You need to enable Kubuntu backports ppa and upgrade your version
(https://launchpad.net/~kubuntu-ppa/+archive/ubuntu/backports)
Also there's a bug with a missing dependency
(https://bugs.launchpad.net/ubuntu