Hi there @amirsamir92 ,
Since the iFrame uses the link used to share your file with A360, I would presume that that would be the case. It doesn't explicitly say anywhere if it would expire or not, so therefore I would play it safe and post a copy of the file along with wherever you embed it, therefore having a backup file that people can look at no matter what.
I hope this helps, and If it was the solution to your problem please select " Accept as Solution " so others can find the solution faster!
Have a good one,
Cole