Attachment folder in CUP

Hello everyone!!

We are trying to use the attachment folder in CUP, so that the requestor can upload attachments. We have the next network folder for this:

repositorio-seggrcShared DocumentsGRC

When we configure this in CUP, it won't let us, we get an error message: "Asegúrese de que la carpeta existe y que sea susceptible de escritura" (Make sure that the folder exists and is capable of writing). Of course the folder exists, but I'm not very sure what permissions does CUP need in order to be able to write in it?

Thaks a lot!!

Paola