The xtouch x708 tablet does not have Bluetooth. This means that you cannot share any files from the tablet with other devices using Bluetooth connectivity. Therefore, the only way you can share files is by attaching it to the computer and transfer the files. You can view the tablet's specs at http://www.xtouch.ae/plus/view.php?aid=72.
If the Internet is accessible from your devices then just set up a free Dropbox account and install the app on both devices. Any file you copy to the Dropbox folder on one device will immediately show up in the Dropbox folder on the other device. Very simple and quick way to do a file transfer.