I have many times been successful doing bulk import on assets to change owners; however, recently we decided to create “owners” for rooms so we could check out to rooms instead of placing them in a room in the location field option to better be able to see what is in a particular room.  I was advised to use Guest role for these accounts, but when I try to bulk import, these guest roles accounts cannot be matched and do not show up when manually matching.  I was able to get around it by changing roll to Staff, uploading and then changing owner role back to guest, but that is less than ideal.  No problem finding guest owners individually to check out...just in bulk.