If it's indeed a life saving situation as you say, a doctor will have to do scans there and not wait to receive possibly outdated imaging data from another country
Also, no hospital in my country is just gonna release my private medical records on the spot because a doctor from another country called and told them to. There's some formal paperwork that needs to be signed by the pacient and if you're in a coma then you can't sign it and if it's an emergency you don't have time for that whole process so they'll have to perform the scans there.
The case of having to quickly send/receive pacient data to or from doctors abroad is not something most public hospitals in my country are prepped for not will they since it's super niche case and in case of emergency they'll do the scans on the spot.
They want scans/tests from trusted source to make decisions about person health/life. The only thing they can trust is whatever they have close and used for years.
If there is no time to get a new scan/test I think there is no time to download stuff or wait for someone to email things.
I brought my CT scans on disc to my ortho who didn't have a CT machine in the last 300 days.
They will do new one right there and if there is no time - there is no time to mail stuff around.
What kind of nerd fantasy is it?
I went once with x-ray on cd that was weeks old for procedure - doctor there went “yeah cool, I don’t care, it is my risk we do new one by personel I know on equipment I know”.