how to implement that all user must upload a attachment before post?
Hook into the post new thread and post new post hooks (I don't remember the exact hook names, they're in the Docs section) and just check if $post has an attachment. If not, don't post and throw error.
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You can only open a new thread if you upload at least one file with at least 1 byte of data on it.

Note: It only checks it at newthread hook, you can still edit the post and delete the attachment...

Attached Files
.php   attachment_required.php (Size: 1.56 KB / Downloads: 55)

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