It would be awesome if once a collection is made, if I need to move it up or down a level I can just drag and drop it rather than re-creating it and moving all the files.
We would absolutely love to make drag and drop collections, but unfortunately it just isn't possible for this version. Basically, the developers will need to use a completely different interface for drag and drop to work. That said, we could look at improved ways to rearrange collections and sub-collections.
That's ok, it doesn't need to be drag and drop. I don't know exactly how everything is built, but what about adding a "Cut" and "Copy" menu option to the context menu for a collection. Then a "Paste" when you have something cut / copied. When you paste the collection, you simply update the parentId of the collection to whatever the new parent is and re-render the UI.
Select the sub-collection you want to move.
Right-click on the new parent for this collection.
You'll have the option to move it.