Judging by the discussion in the comments, it seems to me that this is an issue with the permissions set in Ubuntu, when copying/creating the content on the mounted NTFS partition - so your windows does not see the files.
A sensible(*) set of permissions would be the following entry in
# Mount internal Windows partition with linux compatible permissions, i.e. 755 for directories (dmask=022) and 644 for files (fmask=133)
/dev/NTFS-partition /mnt/windows ntfs-3g uid=username,gid=users,dmask=022,fmask=133 0 2
You can edit your fstab with your favorite editor
sudo nano /etc/fstab
and modify it accordingly, with the correct paths for
/dev and the mount point
uid=username,gid=users map the files and directories created under Linux on the NTFS partition to your Linux user.
While the options
dmask=022,fmask=133 are the mask values (the bit values for the permissions that are not present) for the octal permission sets of "755" and "644" respectively.
dmask is for directory creation and
fmaskfor file creation.
Here is a great Ubuntu wiki entry on the whole Linux permission system, which covers much more than I could in one answer here.
For ease of use to translate to octal permissions, you could use a converter homepage like this on the net
If you are content with your mount options you can either mount the partition with
sudo mount /mnt/your/windows/path
or, if it is already auto-mounted by ubuntu and giving you
device busyerrors, you'd have to first unmount it via
sudo umount /dev/NTFS-partition
or simply reboot.
(*)Taken from the Arch Wiki entry on mounting NTFS partitions.