[gallery] lost relationship with post

I recently had to change hosting providers, and in doing so I exported and re-imported wordpress posts using the WordPress exporter/importer. All of my posts made it over fine, but one problem I’m having now is that [gallery] does not work anymore.

I know that [gallery] see’s what photos you upload while you’re writing on a certain posts, and calls that the gallery photos. But that relationship is apparently lost.

Is there a way to manually tell photos they are related to a individual post, so the [gallery] code starts working again?

Thanks in advance.