Like half the teachers in Scotland I’ve been spending a lot of time in Teams recently ¹.
One of the problems I’ve had is pupils not seeing the slides when I use PowerPoint. It is not a PowerPoint problem as we have the same problem with screen sharing and the Whiteboard. Ironically the problem shows up for the children who are in school. I presume a bandwidth problem.

I’ve been working around the problem by taking screenshots as we go through a presentation and pasting into the chat. Somewhat to my surprise this works well.

On a mac ⌘-shift-4 give me a cross hair and if I hold the control key down then I release the mouse the image goes to the clipboard and can be pasted into the Teams chat with ⌘-v.

I’ve found this really quick to do. In fact last session when I ended up using the chat as a presentation tool this time around Teams seems more reliable, but this is stll good for the pupils on the end of a poor connection.