filename directive on page

Question

It would be great to be able to have the source filename put into a footer when generating/saving a diagram.  This would help as a reference to someone viewing the diagram (i.e. how do I change this? what is the filename that holds the source code?).

Answer 1

You can use:

caption %filename()

This is not working on online server 

Comments

But 

footer

%filename()

endfooter

Does work - it has no filename defined online so shows blank, but this way doesn't crash.

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Yes, there is no filename defined on online server as I write in my answer:

    This is not working on online server