How is security going to be handled with Shared Channels? Eg, there is a ton of private/proprietary information that may not want to be shared between companies/partners/vendors. Now I can just send a file through chat to a vendor (presumably, not sure what will be allowed and not be allowed) ? This makes me nervous. But I guess this could always be done via email between companies/vendors/partners, so the onus is still on the individual to be responsible and follow internal company policies in making the determination about what to share at the end of the day.
