Error when copying files: "ENOTSUP: operation not supported on socket, copyfile"

I'm trying to copy files between folders in a mounted directory.

I create a new dir (and set chmod 777) and then copy like so:

async ({ destDir, files }) => {
    return await Promise.all(
      files.map((filePath) => {
        const fileName = path.basename(filePath);

        return fs
          .copyFile(filePath, path.join(destDir, fileName))
          .then(() => fs.chmod(filePath, "777"));
      }),
    );
  }

and getting this error which I can find nothing about:

ENOTSUP: operation not supported on socket, copyfile ....

Any solution would be welcome