question: If you have OneDrive, or DropBox why on earth would you want to have a file stored locally and take up valuable space on your hard drive? With free WiFi available just about anywhere these days I am rarely without a WiFi connection and when I am those are times when I really should not be accessing it anyway (driving). I also have devices that have cellular capability and Cell coverage is pretty much everywhere as it is. Sure free wifi can, at times be painfully slow, which is why I turn it off and go to the LTE service when I suspect a slow connection.
In addition, when you do have a file stored locally, when you update it it is not updated on the One Drive, iCloud or DropBox and therefore when you access that file on another device it is not the latest version.
Due respect, we were discussing local storage on iPads. There are no hard drives on iPads. It's true that storage capacity is limited, but many of us have adequate memory (64GB for me) and would like to store files locally - in my case, PDF files or notes for reading. For example, there excellent tutorials and "how to" articles available on web sites such as 9to5 Mac, Tuts+, AppleInsider, etc. I like to save these articles as PDF files for later reading.
There are many occasions when internet access is not available, or when your cellular data allotment is limited. Examples - no internet on airplane flights, on car trips (not driving of course), at my 90 y/o mother's home, waiting room at doctor's office, on my own patio where wi-fi doesn't reach ...
Dropbox with local storage for designated individual files is OK, but file access equivalent to that in Mac OSX would be better, and useful to many of us. I would like to be able to convert the contents of a web site on Safari in IOS to a PDF file and store the file directly into the iPad's memory, accessible by an app of my choice - iBooks, Dropbox, Documents by Readdle, etc. That is possible using Safari on the Mac, but not in IOS. In IOS, you must go through a multi-step work-around just to save a web page as a PDF file -- PITA.
IOS is designed so that file access is available only within apps. This is a significant limitation and limits usefulness of the iPad for me.
Speaking of limitations ... IOS has another limitation: it cannot handle certain PDF files created by the "export as PDF" function of Safari on the iMac. I have several of these files created from tutorial articles on the 9to5 Mac web site. These PDF files are fine when viewed on the Mac, but any app on IOS (iBooks, Dropbox, Box, Documents) crashes when trying to open the files. There must be some embedded formatting code or links that IOS can't handle. This is a significant problem since the IOS version of Safari can't create its own PDF files.
As good as IOS is, it's not perfect. Apple still has work to do.