Using an external editor (eg Notepad++)?

[Dave]

I am using the latest version of Arduino IDE under Win 10.

I asked a question a little while ago about this and was told that the
settings option to use an external editor was no longer needed because
the IDE handled this automatically.

This is certainly true if the sketch file is on a local disk.

However, I have found that if the file is on a remote NAS the behaviour
is a little odd :-

If I save a modified file under Notepad++ to a NAS (in my case XigmaNAS
(Linux based NAS)) then the changes do NOT appear on the IDE, however if
I compile the file it compiles the modified version but the IDE still
displays the old version!!!

Notepad++ detects if the file on the NAS is modified by another program,
so it must be possible.  I seem to remember that Notepad++ handles
remote file changes differently because the windows change detection
scheme is not available on all remote shares.

Is there a way around this, it is very confusing! I looked for a way to
force the IDE to reload the source file but could find nothing.

Incidentally, the v1 IDE handled this correctly.

Regards,
Dave