The saving process is endless, and I can't do anything while it's happening.
Unfortunately, that is a known bug that has spiked up recently probably due to a browser update, if I were to assume. It is caused by the game trying to take a screenshot of itself when you save. It should be fixed in the upcoming update, but for now I would suggest to potentially try Firefox or try to save when in a scene (not when navigating the map), as some people have said it works when they do it this way.