Using this module is quite straight forward, just install Riru (Riru - Core) and Riru - Clipboard Whitelist with Magisk Manager (both avaliable in the official Magisk module repository), and do a reboot.

Then, head toward a shell (JuiceSSH, Termux, whatever you like), obtain root privilege (via typing su and allow the app to use root access), and type:

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# Here, org.kde.kdeconnect_tp is a example. You can also add other apps.
# Just replace the package name and do this multiple times.
echo "org.kde.kdeconnect_tp" >> /data/misc/clipboard/whitelist.list

Then do another reboot. Now the clipboard sync capability of KDE Connect should work as before!