product attributes

Hi everyone,

I have quite complex products and would love to enable customers to see and edit product attributes in the cart (and maybe on the checkout form as well).

I installed the Commerce Product Attributes module, but can't figure it out.

It tells me that

You need to add a new field in the cart view. To do this edit the cart view > add field > add attribute field. You may want to remove the product title field.

I try to setup a commerce site where the customer can order prints. The prints can have choices of papersize and paperquality. These are setup as attributes fields at a new product type called print.
Beside that the customer has to upload the picture he wants to get printed. Therefore I created a custom line-item with a file field to collect the file. Then, after creating the product display, the product shows up ok with the two selection fields and the file upload field.