In order to get the list of all my MediaItems I have to loop over all the sub-folders and save the media items off to a list like - 

Whilst adding them is fine and for another met criteria adds properties of each item to mark up within the opening loop. When trying to do the following after all that is done I get a whole set of errors.

     
   <a href="@Model.MediaById(@sign.videoContent).umbracoFile">            
     <header>
       <h2>@sign.title</h2>
     </header>
   </a>    
 </div>

Note - I am referencing @using umbraco.MacroEngines; But this gives me: 

The type arguments for method 'System.Linq.Enumerable.OrderBy(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

And then without the OrderBy in the same loop the items that had properties before I saved them to the list are unrecognised.

I've checked in the original loop, to get them out the folders, that the properties exist on the media items. The type that is being added to the list is DynamicMedia and the type that 'sign' is in the above foreach is DynamicMedia (They're the same item) - but once it is saved off to that list it loses the properties and I cannot reference them.

Any help here would be greatly appreciated.

Cheers!