Reported by @iron moss
Bug Report: Attachments drop when switching model
`Steps to Reproduce`
Open Edge.
Browse to https://chatgpt.com/
Check to make sure model is in instant or thinking.
Attach 1 or more files.
Switch the model to Pro.
`Expected Result`
Attached file(s) stay attached to conversation and you can send the prompt.
`Actual Result`
File(s) unattach, must reattach before you send the prompt.
`Environment`
Windows 11 Edge Browser