I have two a7rIIs. I sometimes use them together while shooting a job. That creates a potential for duplicate file names which, when importing into Lightroom, can cause a problem. With my Canon 5DIIIs I was able to create a file naming pre-fix in the camera to ensure no duplication. I can't find that capability in the Sony firmware.
Lightroom has a means to rename the files on import by including the serial number. I'd like to do that since it doesn't require me to know which camera the card is from when loading it. However, for some reason the EXIF data does not include the camera serial number. Does anyone know how to get it into the EXIF data?