I had File A open with full access privileges and File B with non-full access privileges.
My access privilege set for File B was set to disconnect the user after idle and the feature was enabled on the server.
When the idle time limit was reached, a dialog appeared telling me the File B will be closed due to my inactivity.
I did not do anything and within a minute or so I got disconnected from the File B and the dialog disappeared.
Then every reference to File B in File A was showing <File Missing>.
I could not even resolve it by reopening File B. When I tried to do Open Remote, it simply did not do anything.
It did not even show me an error message.
Expected behavior: Re-opening the File B should work just fine, plus using anything in the File A that requires File B as external data source should automatically re-open the File B.
Experienced in FileMaker Pro Advanced 16v3 on both Mac and Windows, connecting to FileMaker Server 15v3.