emails alerts and custom column required

Question

Hi,

I've created a document list and I've added some custom columns required. I've created an alerts to send an email when some document is added, changed, deleted... but there is some strange.

When I upload a new document using the web site and I fill in the custom columns required, sharepoint send me an added email without the custom columns required. If I change this document, it send me a change email with the custom columns required filled in in the email.

I don't know why If I create a new document, in the alert email, the custom columns requiered are not filled in, but If I change this document, in the alert email, do appear the custom columns required filled in.

Why it is happening?

I'd like that when I create a new document and I fill in the custom columns required, in the alert email, appear the custom columns required filled in, but I don't know how to do it.

Thanks

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santiago