I found this problem causing me very annoying cannot drag and drop files in Google Drive. It used to work fine several years ago.
I did try almost all the browsers, still cannot finally go to the original: Chrome. Still, the same things happen. You can drag the file but it did not work and cannot save the file in your Google drive.
Search and found several solutions but not working, so I found this simple solution:
Just use the Chrome Beta version, it solved the problem:
The following is where to download the Chrome Beta:
