Dear Sirs/Madamme

I have multiple PDB'a (ca.40) in the model panel.
While trying to save each model in single file using option "Save multiple models in multiple files" I got this message: You must provide a file name that contains either $name or $number.
I set the name to eg. A1_01 and/or A1_$01 but none of this works.
How shall I manage that?

Many thanks
Kind regards