Sending multimedia content and documents within chat conversations in Microsoft Teams
We figured out how to get around this Microsoft glitch. Not sure why they changed it. On the iPhone if you go into the Photo's app, and click the share icon in the bottom left and tap that, and then select Teams as the app to share it in and share it that way they will be able to download it. It will give you a message that it exceeds the file size and will have to send it as an attachment and you can just click Continue and it will send it anyway.