Why is span-number not applied in blueprint?

I have some textfields with the class span-4 and they are nicely styled开发者_运维知识库 and aligned. When I try to apply the same classes to upload fields it seems as they have no effect. I also tried other span number, but still nothing happens.

How do we handle upload field styling with blueprint?

An upload field is not handled in the same way as normal fields, there's a helpful guide on how to custumize upload inputs - This article should take you through what is possible and what's not.