Virtualbox Sharing folder between two operating systems.

Environment ubuntu as guest os on Windows host.

Step 1: Open the virtual box --> settings --> Shared folders

Step 2: Windows host  create a folder name share and  Add the path in the virtual box as 'below Screenshot

Added path as above

Step 3: On the the guset OS make a directory to use for your mount preferably in your home directory.

            mkdir share

Step 4:  sudo mount -t vboxsf share ~/share/