Export to Blue Ray Disc or ISO

I have been creating video in 2019 (because of new features), then save as mp4. Then put that into PreE12 to make Blu-ray discs. Yes, my 12 is still working, but bringing back files does not work.

Thanks, but feel thew exclusion of this feature is a backwards step as I can produce Blue Ray discs using DVD Architect, but I would like to be able to do this directly from PreE 2019 

I totally agree about the backwards step. They seem to only care about the latest thing, putting stuff into the cloud. And of course, it keeps their costs down.