wp_postmeta for wp_attached_file

  • I am trying to synchronize a test and production database and had a question on the wp_postmeta table.

    In the wp_postmeda table, there is an entry for an attached file (meta_key = _wp_attached_file) with a meta_value of the directory I uploaded the file from.

    For example, I uploaded the file from /temp and WordPress placed the file in the /wp-content/uploads directory. However, the meta_value in wp_postmeta table is still /temp.

    What is the meta_value used for? Why is it not the directory the file is in on the server?

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