When trying to insert an image from the clipboard, nothing happens.
When inserting an image from clipboard, it will insert the image and it will look something like this in the markdown:

This is already known. See https://github.com/BoostIO/Boostnote/issues/2716 for an explanation and a workaround :)
@BjarkePedersen please use Cmd+Shift+V for the time being when pasting an image
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@BjarkePedersen please use
Cmd+Shift+Vfor the time being when pasting an image