Sent the 3 segmented files separately through iMessage and received them in turn on the MBP by sending it to myself. My file was larger than my ISP allows as a single shot transfer 20MB, so I then had to trim the file in the VM app to a usable size. However using iMessage and the Voice Memo app when in any particular VM file there is the option to manipulate where you can “share” the file. I needed to translate the recording to text, but could not get the VM to transfer to iTunes.
In the past with different model iPhones I got transfer. I have discovered a work around for the no transference of Voice memo’s from iPhone to iTunes on MBP