The access type of the recipient.Values: EXTERNAL_SHARED_LINK_ACCESS_TYPE_UNINITIALIZED (0), EXTERNAL_SHARED_LINK_ACCESS_TYPE_DOWNLOAD (1), EXTERNAL_SHARED_LINK_ACCESS_TYPE_PREVIEW (2), EXTERNAL_SHARED_LINK_ACCESS_TYPE_EDIT (3).
SetSharedLinkRecipient.recipient -- The information about the shared link recipient linked to the access key to update expiration time and access type.