Writing the right rename expression is surely the most delicate part of Siren usage.
It expresses the way a new file name is constructed.
It can contain text (which is copied as it is) and variables which are replaced with the
values they have for the file.
The folowing pages will describe you how to get the best of it :
Two tools should help you :
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Moreover you'll find in this help a lot of useful examples that you'll can copy/paste to Siren's "expression" field.