[wp-hackers] How and where is _wp_attachment_metadata added?

[Alex Andrews]

 Hi all, 

Looking to do something clever using _wp_attachment_metadata, as I note in there is where we can find the location of all the various sizes of images that are produced, for example, the thumbnail and so on? How do we add size formats to this?

When is this added in the normal upload run and what is its format?

All the best,

Alex 

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Alex Andrews
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