Collabora on Android?

Hi,
Collabora works fine for me on Desktop-Client as well as with browser on Android, BUT: It seems not to work with Android-App. I tried to use it with oCloud app as wenn as Cirrus (not with ownCloud app so far, because it is not freeware). Is there a possibility to edit documents via app? (If it works fine with ownCloud app, I will buy it).

thank you,
taifun