Hi @deerhake_13 ...
Unfortunately, I was unable to replicate what you are experiencing in the Canvas Inbox. I logged in as a fake dummy student account, "Frodo Baggins". I sent a message via Frodo's Inbox with a small JPG image attachment to another fake dummy student, "Optimus Prime". Then, I logged in as Optimus to read that message in Optimus' Canvas Inbox. I then forwarded that message to my own Canvas Inbox. When I opened up my own Inbox, I saw the message from Optimus, and below that I saw the message from Frodo with his attached JPG image.
You might want to reach out to Canvas Support if that workflow is not working for you. How do I contact Canvas Support?
Please keep us updated on your progress...thanks!
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