Aha, not a silly question.
Once you have uploaded the images to the storage bin, go back to your album. You should be on the front "page", then you click on "enter". On the bottom right hand corner, there is a button for "add images" or something like that. When you click on that, you get to a page that has all of your storage bin images. When you click on them from the main box, they appear on the right hand side, and once all of the images you want to add to your album are selected in the right hand column, click on Continue, and they get moved to the album.
Hope that makes sense.