Ok this was a little confusing for me but I finally realized what was happening. So I decided to give my 2 cents in hopes that it will be more clear for others and if I forget sometime in the future : ).
I was not using the name of the share I created in the VM, instead I used share or vb_share when the name of my share was wd so this had me confused for a minute.
First add your share directory in the VM Box: enter image description here
Whatever you name your share here will be the name you will need to use when mounting in the vm guest OS. i.e. I named mine "wd" for my western digital passport drive.
Next on the the guset OS make a directory to use for your mount preferably in your home directory.
mkdir share
Next open the terminal and copy and paste the following or type it in. You can enable shared clipboard under Device-> Shared Clipboard-> Bidirectional
sudo mount -t vboxsf wd ~/share/
You should now be able to copy files between OS's using the folder "share" in your home directory.
Hope this Helps!