adb shell push c:/file.txt /sdcard/file.txt

I did some googling to no avail.

Then I remembered that pushing and pulling is not done in the shell, it’s just done with adb.

Thus, it should have been:

adb push c:/file.txt /sdcard/file.txt

Which succeeds. I know it’s a silly error to make, but I thought I’d share this in case anybody else uses the adb shell push instead of regular adb push and can’t figure out why permission is denied.