Hello and Welcome to the Forum
So what I am going to guess I am seeing is your using Chrome or maybe Edge. Either way that happens to be one of the biggest issues I have is there is so many things cut from Chrome and Edge use that makes it very hard to be happy with my NVR's today.
Some do have a Backup feature and some don't so that would be like your Playback area just a Backup button on the main menu area..
Next what does it leave you with if your system isn't one of them with the option in Chrome or Edge. Well in Edge you can use the Config area of Edge and setup the IP address to work in what is called IE Mode only down side to this is you have to update that option every month by adding it back. Next you can use IE if your computer still has it. That Data from the Post by Amcrest is done in 2018 and was when most Recorders were still working on IE platform so IE still has what is shown in the data of that posting..
Next and might be a better way is to use ASP. While you don't have to use it for anything more then just being able to Transfer your footage as it can take up CPU and Ram.. Now I have issue of doing things little different then others and at times have more then 1 Live View open while also in Playback and that could be way my CPU and Ram would be higher then others. As long as you keep to 1 playback or live view setup things should be ok..
So option outside of having backup would be as I said. IE Mode in Edge or Chrome and easier to setup in Edge. Use IE and last and for some might be best option is to use ASP...
Mine using Chrome

- Screenshot (2764).png (70.59 KiB) Viewed 1691 times
Using IE

- Screenshot (2765).png (104.2 KiB) Viewed 1691 times
and ASP

- Screenshot (2766).png (111.04 KiB) Viewed 1691 times
Be Safe.