How to edit files on/copy to an NFTS external hard drive? I've got a WD MyBook external hard drive formatted in NTFS with files on it. How can I edit files already on it as well as paste files to it?

I've installing Mounty and when I try to re-mount it read-write I get the following error message:

"Volume "MyBook" not re-mountable. The volume is not re-mountable in read/write mode. Probably it was not clean unmounted before."

I've tried another external hard drive also formatted in NTFS and that works.

I've tried one of the free solutions mentioned in the previous post - How do I write to NTFS drives in OS X?
I have faced similar problem with my WD external 1 TB drive formatted as NTFS.

For writing, you'll need to install a proprietary NTFS driver for macOS called Paragon NTFS Driver for Mac.

You can follow the instructions on this support article on WD website, How to Install the Paragon NTFS Driver for Mac.