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Add in $args, it is important.

'post_status' => 'any'

Do not: 'post_status' => null

Add in $args, it is important.

'post_status' => 'any'

Do not: 'post_status' => null

This is important because attachments don't have a post_status, so the default value for post_status, published, will find no attachments.

Add in args, it is important.

'post_status' => 'any'

Do not: 'post_status' => null

Add in $args, it is important.

'post_status' => 'any'

Do not: 'post_status' => null

add in args, it is important.

'post_status' => 'any'

do not: 'post_status' => null

Add in args, it is important.

'post_status' => 'any'

Do not: 'post_status' => null