I used to be able to do this, it worked flawlessly, I would share an episode or movie from iPhone to iPad, or viceversa, and it would just open and play on the other device.
No, instead of opening, it goes to the files app, and there you can “send to infuse”, but that just brings up “an error occurred loading this content. Sorry this type of content is not supported yet” error message, and this happens with all types of supported files.
Have tested disabling the files app, same error.
Infuse, iPhone 15 Pro & iPad Pro 2024, all up to date.