Why:
In WordPress one can only attach a file to a single parent post. This is because the relationship is stored in the wp_post table as the post_parent field. It’s a bigint(20) type so it can only contain a single number (ID).
Workaround:
We would need to cook something ourselves, maybe that could be by using a custom taxonomy for our attachments or perhaps using custom fields (post meta) to store the attachments IDs?
Or we could try some plugins out there that can help us re-using our attachments.
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