Thank you for the post.
Which file were you viewing, the file local to the iPad or the file copied into iTunes?
A file can be worked on via FileMaker Network Sharing or a file can be worked on locally when copied from iTunes to the device. From the "Important Notes" section of the application description in iTunes:
"Sync is not natively supported but can be implemented with custom development. However, database files can be copied or emailed between the device and the desktop."
For additional information consult the FileMaker Go 12 Development Guide. Page 7 of the guide states to keep the following in mind:
"When you transfer a file to your device, you are creating a copy of the remote file. Data changes made on your device are not synchronized to the remote file, and vice versa. You can set up the file to import and update data from the local file to the hosted file using FileMaker Pro; see “Importing to and from a transferred file.”"