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I'm looking for a way to hook into the process of uploading a featured image. Ideally I would want to be able to do some stuff right when the upload has finished, before the thumbnails are generated.

What I wanna do is when the image is finished uploading, the user will be presented with the possibility to resize and crop their image before it's actually set as the featured image.

Is this possible, or should I rather be thinking of a custom uploader that I use to later set the finished image as the featured image?

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