Thank you for your post!
It may be possible to import the reference data (such as file path) over ODBC, but it will not be possible to import embedded Files. This may be the limitation you are running into with this. You might see FileMaker Server 15 ODBC Guide.
I'm also going to move this thread from the FileMaker Community Feedback Space (which is specifically for input on the Community itself) to the Discussions Space where you should receive more views and potentially more feedback on this topic!