[pmwiki-users] grab Attach: url in a PTV?

[SteP]

Hi all, is it possible to set a PTV to the path computed by Attach: ?
What I'm looking for is a way to use attachments as markup parameters.
For instance (fake syntax below):

:cover:`Attach:cover.jpg`
(:album thumb={$:cover} :)

where I have used batckticks to mean "give me the path of the Attach operation.
It would also help if Attach didn't display cover.jpg when used in this fashion.

Can this be done with existing facilities?  TIA
SteP