Hi, thank you for ZorinOS, it works better than 24.04 , I recommend.
On Zorin OS 17.2 Pro, with Kdenlive (Version 24.12.2 on AppImage (standard installation)), with Wayland,
I would like to grab my screen with the Screen grab function.
¡Hola! y bienvenido. I've never used screen capture function of KDEnlive. What I currently do is use Simple Screen Recorder to capture the desktop/VM, then use KDEnlive for ediring and then render it for upload to Vimeo.
You could try the Flatpak Version; it is available in the Software Store. Or You can install the APT Version which is a bit older but it would be the native Package Format.
Another Thing: You could look if all Codecs are installed. For this, go in the Software Store, scroll on the starpage all the Way down and there You find the ''Codecs'' Button. click on it and there will be shown available Codecs for Installation. Install them all.
For more Codecs, open the Terminal and type sudo apt install ubuntu-restricted-extras for installing more Codecs. When You install it, You have to agree to a Licence Agreement because in this Package are Microsoft Fonts included, too.
And then, You could install VLC Media Player to get more, too. You can do that with the Command sudo apt install vlc
If I'm doing any screencapture I generally turn to OBS to do that. A little more effort to setup than any of the other options, but I like the flexibility it gives me when doing so. I don't think I've ever tried to do this through kdenlive, and I didn't even know they had the ability to do so, tbh.