Create somewhere on your PC a folder called “VM_Shared”.
Go on the settings of the VM than you created. Go to “Shared Folders” and add the folder than you created. “Auto-mount” and “Make Permanent” have to be selected.
Play the VM.
Open a terminal (CTRL+ALT+T) and write:
Sudo adduser ur vboxsf
Reboot.
The shared Folder will be inside of : /media
This method is working for me 