title: How to append array of bytes to the existed StorageFile?
body: <p>I need to write to a file data by chunks of bytes consequentially (in my Metro app) and there is a class <code>FileIO</code> with methods <code>AppendTextAsync</code> and <code>WriteBytesAsync</code> but without needed <code>AppendBytesAsync</code> so how can I append an array of bytes to a <code>StorageFile</code>?</p>