Bulk import via CSV - Device management templates

Hello,

we would like to understand more what we are seeing:

  1. sometimes we see created for example 40 and successful 43, what does it mean? what could be the remaining 3? is it some already existing devices which were updated by some new values of some fields? and those fields are the non mandatory fields right?
  2. sometimes we get failed = X lets say 3. Why would it fail? is it because the mandatory fields which are name/ID already exist??
  3. so assuming that the mandatory fields are name/ID which is our understanding so far based on what we saw, lets call it the unique composite key, if our understanding is correct, if the same device name previously created using name#1/ID#1 is received again as part of a new bulk import but this time name#1/ID#2, would it be created? or it fails?