Why do pasted png get converted to jpg

Thank you for your answer! I think I start to understand this now.

-----------------------------149589358933568048074206291858

Content-Disposition: form-data; name="type"

composer

-----------------------------149589358933568048074206291858

Content-Disposition: form-data; name="files[]"; filename="Screenshot_2020-05-05.png"

Content-Type: image/png

How can I reproduce this? I used the inspector and looked at the request and saw this when pasting a png, when I tried with a jpg it will say image/jpg. What does raw bitmap mean? With which browser does this happen (I use firefox)?

EDIT okay never mind, I think maybe I misunderstood what pasted means. I actually did drag and drop. I tried to copy and paste an image, but it seems like it does not work in general on my system. It just adds this text to the the composer:

x-special/nautilus-clipboard
copy
file:///home/username/Downloads/Screenshot_2020-05-05%20.png
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