Good app but the iphone is not at the top

Let things be clear, this hard drive is perfect, it is simple to use and compact 1TB is just nickel.
However the WD my cloud application to be able to use the disk with tablet and smartphone is far from perfect.
Most of the time when buying this kind of product is to communicate with the tablet or smartphone, as is the case Apple products that do not just synchronize allow movies or music on the go, be able to have Access to this type of file rather heavy easily. Well the WD app does not read avi or MKV !!!!!
But what the designers think when they do this kind of app ???
Here we'll just put the app is compatible with MP4 ... Frankly if I had known that before I would not have bought the hard drive, and not because of the disc but this logic beyond me. It is clear that I will not convert all of my dear children busy to MP4 I have other things to do so I opted for other apps, but the connection is more random and brief we will say that it helps out in awaiting an update to Logic can play all video formats to give complete freedom to the customer.