Public access to personal video link?

Hello everyone, a few days ago my mother sent me a large file video. When the video was sent to me, it was sent as a link and not just a video. I am unable to do anything with the video other than view/play it, I can't even download it. 
 

The main issue I am having is that the link says, "Large file available, click to Download/Play. This link will be publicly accessible by anyone for the next 3 days." I am concerned about the "publicly accessible" part.

I would like to point out that she has a Google Pixel and I have an iPhone 14. It was sent through RCS. It was NOT sent as a Google photo link, I tested that out and it looked different then this link. This link says it is a T-Mobile created link and not a Google photo link.

Has this happened to anyone? Is the video truly publicly accessible or would someone need to have access to the link technically to view it? Please help!!