gmail nodes

I'm using the Gmail Nodes, I'm using a testing account that only has 2 emails (both with attachments), when I test the node "Get Inbox" I see the 2 emails. But when a use the node "Get Email Attachment" without changing any parameters or selecting any filter I don't get any result. I try changing some parameters (From, To, Subject, Etc) but it's doesn't help, I got 0 result everytime. What I have to do to get the list of attachments? Thank!