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Currently, the ImageView Inspector is only available for responses.
Why not enable it for requests?
What page or service are you using which sends images in the request?(Unlike with responses, it's much more likely that an image upload depends on a bespoke encoding/serialization making it much harder for Fiddler to support in a general way).
My own which is still in development. I'm simply POSTing an instance of File (Content-Type: image/jpeg).
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