php - auto upload and set featured image to wordpress post based on external url -

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i have music website based on soundcloud api , have custom post type called albums , each post track, @ moment can details need soundcloud track track image url. how can use url soundcloud , make wordpress download image , set post featured image?

i have tried , searched on net , couldn't find nothing on how auto upload , publish external featured image. perfect!

cheers!

try extension wordpress:
http://wordpress.org/plugins/wp-remote-thumbnail/
http://magnigenie.com/wp-remote-thumbnail-set-external-images-featured-image/


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