First, are you trying to edit on an Android platform, or in Mint?
If you are editing on an Android platform, there are other options for editing documents and spreadsheets, but you seem to be specifying Microsoft Office type documents. If this is so, you are limited at present AFAIK to Google Docs and the Microsoft web offerings if you want to later share them back with the Microsoft Office originators.
On Mint, you can also use LibreOffice, Zoho Office, Abiword/Gnumeric on GNOME derivatives, or Koffice products on KDE.
LMDE Mate 64-bit, LM16 Mate 64-bit
Debian Xfce 64-bit, Xubuntu 13.10 64-bit, Xubuntu Trusty Tahr 64-bit, Antergos Xfce 64-bit, PCLinuxOS LXDE 64-bit