[chimerax-users] Modeler interphase of the Chimera-x

Dear Chimera-X users ! I am trying to use the Modeller interphase of the Chimera-X, with the aim to model missed segments from the input PDB structure. I have very basic questions: 1) In the top, there is a Sequence Alignment dialog box but I don't understand how to provide the alignment there. Should it be the alignment of the sequence of the target pdb (template) ? If so, how could it be obtained supposing that I have i) a pdb with missing fragments as well as ii) the full sequence. Many thanks in advance Enrico