An ancillary probate is required if you want to have an out of state administrator deed the properties out of the estate to the beneficiaries. It is not required if you just record exemplified copies of the out of state probate, but you have to record enough of the records to show the will was admitted to probate and who the beneficiaries under the will are. This is why many people just opt to record the probate records. When in doubt, record anything you think you need of the probate file.