Re move files when in openELEC
Two choices that are relatively easy...
1) Use Kodi's File Manager. See
http://kodi.wiki/view/File_manager
The one thing you'll need to remember is there won't be a copy/move type command in the context menu (see that link) until there is a suitable location navigated to in the other pane.
(I forgot to do this just now and couldn't at first work out why there was no Copy/Move command!)
2) Samba share - Unless you disabled it during initial set up, your T8-S's file system is accessible when in openELEC via SMB. Open Windows' File Explorer (Hold down the Windows flag on your keyboard and tap E) then expand the Network section. It should fine your T8-S if your home network isn't blocking anything. You can cut/copy/paste/delete from here
( 3) You could also use something like Bitvise's SSH client or similar and connect that (terminal, FTP etc) )
=-=-=-=-=-
A little redundant given the above, but I'm not sure where the openELEC partition/data is found when in Android. If I don't post back by Monday and you're still interested, give me a poke please.