What the heck is Myllerman talking about? UAC? Edge? IE 11? What is EI 11?
Sorry, have not been home and in a hurry so i got a bit mixed up. I am not quite sure what OP is asking at this point. Orginal question was why the browser did not save pictures/videos from the NVR UI? (i think?)
I then stated that running the browser as administrator could fix the issue. I then stated that running IE11 as administrator is not very safe for regular browsing as i got the impression OP was using it for that.
Better to use a separate browser for that. I use IE11 for the cameras as the plugins dont work very good with newer browsers. To make the interface being able to save pictures and videos to the disk i have to run IE11 as administrator.
Disableing UAC for specific programs is mayby solution too but i have not tried that so i leave that up to someone else to explain.