Why doesn't this work:

dd bs=4M if=/home/doug/Downloads/Win10_21H1_English_x64 of=/dev/sda

Here is the downloaded file in /home/doug/Downloads:

-rw-r--r-- 1 doug users 5824122880 Jul 22 22:20 Win10_21H1_English_x64.iso

Here is the fail message:

dd: failed to open '/home/doug/Downloads/Win10_21H1_English_x64': No such file or directory

(Since I am IN that directory, I first tried without specifying the directory, but got the same failure.)

Confused as usual--doug