option 1: [ Enable drag and drop ]
=> go to devices.
=> select drag and drop
=> select bi-directional.
==> you just have to drag and drop files b/w host and machine to copy or paste.
option 2: [make a shared folder and access that in all your virtual machines ]
=>https://helpdeskgeek.com/virtualization/virtualbox-share-folder-host-guest/
!