I have never seen any browser with a similar function...
Everyone downloads thousands of photos, videos, text files from the internet and in the speed of time we save and disorganize any folder on our device...
my suggestion is that I can choose a "downloads" folder for each type of download, i.e., as soon as I download a video it goes directly to the videos folder, when I download an image it goes to the images folder and so on for each type of file.
So basically, I would have multiple choices of download folder choices in the Opera and Opera GX settings, being a folder setting for when I download Images, Videos, PDF, 3D Objects, Audio and so on.
Example: