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Changes between Initial Version and Version 1 of Ticket #47872, comment 32

initial	v1
4	4	For me, what differentiates new uploads from existing attachments:
5	5	- `wp_insert_attachment()` is called before, so the hook `add_attachment` is fired.
6		- Or, the hook `wp_ajax_media~~_create_image_~~subsizes` is fired.
	6	- Or, the hook `wp_ajax_media-create-image-subsizes` is fired.
7	7	In both cases we (as in "third party plugins", not WP core) can use the fired hook to store the attachment ID, and use it later in the new hook for comparison. It's a bit tricky, not clean, but it works (at least for `add_attachment` so far). This is actually [https://github.com/wp-media/imagify-plugin/blob/master/inc/classes/class-imagify-auto-optimization.php what I do in Imagify].
8	8