Import Project Desktop files to Project for the web API

In response to Conrad's comment "I will wait for these unsupported features to be implemented before using Project Online. Absolutely need those to use it" -  Project Online interfaces directly with the Project Professional Desktop client.  I see little point in anyone wanting to import from Project for the Web to Project Online.  If you use Project Online you already have all of the features and capabilities needed.  The list of unsupported features at the head of this thread refers to Project for the Web NOT Project Online (where all of those unsupported features already exist). To be clear the unsupported features refers to Project for the Web not Project Online.   You can use Project Online Essentials for pure browser capability. Unfortunately Microsoft have done a poor job of the messaging which has confused customers and prospects.   And for clarity, the original comment referred to the inability to import Project mpp files (from the Project Desktop Client) to Project for the Web.   Project for the Web is a very lightweight browser only solution compared to the full Project Online solution.