Michaels Andrews proposed this term in the prior Drive workflow (see terms register). His comment in relation to "omnichannel" and the dropped term, "multichannel":
I think we might want to include "multiplatform publishing". The perspective is on the different platforms the publisher needs to address. Omnichannel is a customer orientation, providing customers with access to many channels.
Michaels Andrews proposed this term in the prior Drive workflow (see terms register). His comment in relation to "omnichannel" and the dropped term, "multichannel":