It amazes me that this topic is not on top. It might be debated to death during the DP's though.
Why can't I attach a file from iCloud (whatever file that is! (think PDF's )) to an e-mail?
Why can't I send a PDF file with Messages? Why am I NOT able to actually open a pdf from iCloud drive on my iPhone/iPad??? Because there is no Preview application on iOS?? I can't store a Numbers file in iCloud drive (in Yosemite) in a different folder (say a project folder), my iPhone will simply not see the file because it is not in that specific Numbers folder
I so seriously hoped that iCloud drive on iOS would take away 99% of the hurdles in sending/receiving/etc. files on iOS but where still nowhere.
Windows Phone does this almost perfect. Apple should be ashamed.
Started a similar thread, didn't see this one, good points all. The only app I found that works now is "Cloud Drive Explorer". Only caveat is you can open and view folders and files, but you can't delete, move, send, etc. Might be Apple's lockdown with iCloud, perhaps using an iCloud generated password would allow better access.