Copy using WinSCP to EC2 getting Permission denied

It appears to be a Linux file permission issue. Make sure the user ( whose ppk is being used) is allowed to write to the destination directory. To test this, ssh to the instance as same user and try to create a test file.

Example command:

$ touch /path_to_destination_dir/testfile

Check the directory permissions using ls command and modify the permissions if requires.

$ ls -ld /path_to_destination_dir

If the write (w) permission is missing for the user, modify the directory permissions using chmod command.