All right, I think I found all the connections…
We’ve got:
- Original custom post in wp_posts with post_type = ‘publication’, in my case. In my example, the ID = 1171.
- File is stored in wp_posts as well with post_type = ‘attachment’. I see post_parent = 1171 and ID = 1264.
- File is associated with the correct field a) in the wp_postmeta table with a post_id = 1264 and a meta_key = ‘_wp_attached_file’. The meta_id = 6000.
- AND in b) the wp_postmeta table with a post_id = 1171 and meta_key = ‘publication_download_file’ (my field name) and a meta_value = 1264
