Additional chat-related features and issues within Microsoft Teams for business
Hmm... It must have something to do with the way our Admins have set policy or something. I am by no means, an expert, but I am the one at my org that has to teach everyone how to use features so I do a lot of testing, BUT... I don't have access to the Teams Admin console for our Tenant.
It doesn't surprise me that you can't save stuff from a Team Channel post, but I'll look into that and see if there is a way, when I have some time...