When pasting ink drawings selected and copied from OneNote for Windows 10 on a Windows 11 computer (although it sounds strange I know many who use this setup) into a field in Anki’s note editor, the image is typically pasted with a paste-… filename.
However it occasionally produces a data:
URL image, such as that in this GitHub Gist, and furthermore this image is only resizable horizontally but not vertically (resizing works fine on other data-URL images for me).