[Rails] Scaffolding of BLOB?

Hi there.
I was looking at the magic scaffolding. :slight_smile:
It looks like you can do great things with it. I did some text and I
like how the new action is rendered by default. For a varchar field
(mysql) I get a nice textbox, for a datetime column I get nice
selectable dropdownlist for d/m/y.
However I am a bit surprised by the field BLOB... I was expecting
something like a "browse for upload" or something like that... and the
BLOB field is instead totally ignored.

Any advice?