what a stinking pile of crap Google drive is if one wants to open /edit a spreadsheet! I just copied (as a test) a file from dropbox to Drive and opened it on my Note 2. first of all, I got a message as it opened that it would be read-only, but I added some text to an empty cell, saved it (it said it was saving to my SD card. HUH???), THEN it said to save/quit/cancel when I tried exiting the file, indicating it was going to ACTUALLY save the file (if I choose) back to Drive. So I selected SAVE, went to my laptop and the file is UNREADABLE. F me.
EDIT: Kingsoft not only won't open some of my excel files, but in the recent past it has trashed those that it has opened, after I've saved them back to Dropbox. I can't trust Kingsoft.