Different Guest User Scenarios in a Microsoft Teams meeting

As Microsoft Teams meeting participants, we all come in different shapes and sizes and flavors. :) When we're joining someone's meeting, we might be a fellow user in their tenant, or we might be an external Guest visiting their tenant. The meeting might be one that someone created in Outlook, or it might be a Channel meeting.  

I tried to show a few of those flavors below, in case it might help someone understand why they're seeing what they're seeing in their next Microsoft Teams meeting (click the images for a larger view):

Meeting Created In	and the User is a	and the User’s tenant is set to	The chat looks like
Outlook	Guest	A tenant different than the meeting	(no files, only the most basic chat)
Outlook	Guest	The same tenant as the meeting	(better chat, but still no files)
Channel	Guest	The same tenant as the meeting	(user gets files (view/edit) and can even see chats created prior to the meeting)
Channel	Guest	A tenant different than the meeting	(no chat, no files)