"Attaching" proxies to clips

Hi,

I keep working with the proxies and realized that if I want to attach proxies created in other project, in a new one, the solution would be selecting those clips in the new project, right click and "attach proxy" (I'm in the spanish version and I don't know the menu name in english). So, a new window appears and here I can select the folders of my proxies. I select it, and although it seems all the clips were attached with the proxies, only the first clip on the list of the previous window got the proxy, the other ones not. If I do one by one it works, but well, it would be nice to reconnect all of them in one step, and more when in my project window I can see that after the first step (connecting all them in one step), on the proxy tab all the clips show "attached" (again, I'm in spanish version, don't know the name in english).

Any solution to this?

Thank you!!