I had the same issue: https://forum.zorin.com/t/files-nautilus-is-not-responding-unkillable-process/54168/34
Nautilus (default File Manager that comes with GNOME/Debian/Ubuntu/Zorin OS) is problematic and worst side of Zorin OS for me.
You can download Dolphin File Manager from software store:
Also if you're transferring files from Android (Linux) to/from Zorin (Linux) there are many problems: https://forum.zorin.com/t/android-file-transfer-libmtp-errors/57030/6 so I suggest you to use Localsend (AppImage version):
It's the fastest file transfer method after tailscale.