First, visit your Members page at https://web.descript.com/members
Now make sure that the correct Drive is selected in the dropdown in the upper right of the screen:
Click "Add member." You can enter any email address, regardless of whether the user already has a Descript account.
We'll send a link to that email address that the user can be click to be added to the drive.
If the member already has a Descript account associated a different email address than the one that was invited, Descript will still link the drive membership to whichever account is logged in when the user clicks the link.