for utils like shared folder, clipboard, you must firstly:

1. enter VM
2. on menu tab(on top of windows), go to “Device” section, click “Insert the Guest Additions disk file into the virtual optical drive”
3. After installing, you’ll see a device with name like VBox_GAs_X.Y.Z appears, mount and open it. Exec sudo sh VBoxLinuxAdditions[-arm64].run / .\\VBoxWindowsAdditions.exe /S
4. Check if no error message.
5. Finally, reboot is suggested (only re-login is not enough for me)
6. When it comes to Linux, you must not wanna only root can access to shared folder, so other user has to be added to group vboxsf