Additional file-related features and issues within Microsoft Teams for business
Hi
I have E5 and I can see the option, but I'm informed that the fix is move to Office 365 for Apps and you will be able to see it again, having said that another member of my team has the same licence and software version as me and can't see it, so the a paradox that sits with Microsoft.
I believe its as a result of an update before or around Christmas, as this is when people in my org started noticing the issue.
Sorry no help but its another iron in the fire of Microsoft get ya stuff sorted!!
Update, it could relate to the version of Teams mine is 1.600.1381 and I can see the option