Importing to Revit + Linking One by One:
Choosing to "Upload Revit family files to dRofus" is particularly useful if there is another Revit project (using the same dRofus database) and you need to load those same Family Types in to the other Revit project. Once you open the other Revit project ("New Project"), you can then browse or search then select a dRofus Item (that had been uploaded with the corresponding Revit Family file from the original Revit project) on the left hand side and then click on "-->":
The Family Types are now loaded within this Revit project, and are also listed within the "Linked items" list as highlighted below: