TLG is distributing general product flyers in sets within the same theme. For
example DOTS and Ninjago Arcade Pods. The flyers are all the same, so not specific
to a particular set.
Can I add those to the catalog? And where: book / gear / catalog / somewhere
else?
You may submit any genuine LEGO item to the catalog.
And where: book / gear / catalog
At this point in time most paper objects should be added as the Books item type.
If the flyers have the characteristics of a catalog, then that's where they'd
go. Otherwise books.