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[–] 3 pts 4y (edited 4y)

Pretty sure it is transporting the binary. The file is not saved, officially, on the machine, so it is possible it is floating around in some temporary folder. On PC, anyways.

The image is actually saved in your device's clipboard encoded in base64 and converted back to a file and stored in your browser's FileList when you paste it, then it is sent with the form when you submit it.

https://w3c.github.io/clipboard-apis

I'm working on a homemade version to paste images from clipboard. Stay Tuned!