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?

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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.