Thank you for your post.
The Snapshot Link file can only be opened in FileMaker Go if the FileMaker Pro database file is present on the iOS device. From your description, it sounds like the database file is only accessed remotely and is not present on the iOS device. That is why you get the message the file could not be opened. Try copying the database file to your iOS device.
For more information, please see page 12 of the FileMaker Go 12 Development Guide at:
Thanks. I copied the database via Itunes and that works fine.
But please keep in mind that you now have TWO copies of your database. Changes made to data on the iOS device will not be in the copy on your Mac and vice versa. You may need to set up some kind of sync capability to keep things straight.