Granted I am new to cnc but this has me stumped., I use Carbide Create (build 813)on a new Mac mini , then save to usb drive and go to load it on an old MacBook Air which has Carbide motion , it always comes up no G code.
Now if I email the same file to my laptop (Mac book pro) and just save the file to the same usb when I go to load it on the air it works fine,
Looking at the file it is smaller when copied direct from Mac mini so it’s not saving everything. how is this possible.
Our recommendation is to save to a local drive, then copy from there.
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That would be the magic fairy dust Apple uses in it’s software.
I’m not a Mac user - I find their OS at times just confounds me. But I suspect instead of saving the file directly when you ask it to, it’s putting a placeholder which is then supposed to get filled up by the file but doesn’t quite get there due to some file system befuddlery which is susposed to make a user feel like things are getting done faster even though what you think has occurred hasn’t actually happened yet.
So I agree with Will’s recommendation.
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Alternate data streams are wild 
I’d look at the mac OS versions.
Well you guys are correct. saving it to the local drive and then copied to flash drive it works fine,
Don’t understand it but it works
Thanks
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I agree with @Chaotica that the magic fairy dust on a MAC is the problem. Under the covers of Mac OS is linux. It may just making a link and not the actual file. Links are not the actual file but a pointer to the original location. Once you move the link to the USB the original file is no longer linked to your hard drive. Folks that have Mac’s love them but there are some strange things that go on in the Mac OS.
Is it possible that the USB drive is formatted in the NTSF file system and the MacBook Air does not have NTSF support?
A family member shared some files on a USB drive that my MacBook Pro could not see, I believe that was the problem.
I can’t speak to the magic dust theory but fwiw this how I send cut files to the MacBook.
For whatever reason I’ve always designed and toolpathed on a PC, cut with a MacBook. Initially utilizing network connections between the two.
After a windows update broke networking for the umpteenth time, instead of trying to fix it (again) I switched to storing cut files from the PC to iCloud.
It’s worked seamlessly for a few years now.
Probably not the best way but it’s my way.