It's fantastic that you have now added attachments. However, the ability to use them in customisations and code is limited without a rather essential feature.

Please add the ability to specify an attachment properties (similar to how item category attributes are inherited) so that an attachment can be assigned a type when it is attached and a comment can be attached.

The ability to set an attachment attribute set allows the following:

I am on a sales order and I can attach a customer purchase order. The attachment can be assigned an attribute of Puchase Order (this is on the attachment attribute set for this type). Another attachment could be the specification drawing.

On an item I could add a specification, a brochure, product information sheet - all separately and with comments. I could then in code choose to include a specific attachment based on its attributes if it exists.

The ability to add a comment deals with the fact that often file names will not be meaningful.

Ideally this would be part of an improved integration with microsoft sharepoint or other online file management systems that support attributes and searching for files.