I can't resize an image by dragging and dropping in Notes.
How do I resize an image in Notes?
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In macOS, you can toggle between thumbnails and actual size (max width = 100%) by right-clicking any image in the note and choosing ‘View as Small Images’. This is not possible to set on iOS.
Try to open the image with preview and zoom it. Then take a screenshot with Command + Shift + 4. Then paste the screen shot back into to note.
It seems Apple Note do not support image resize itself now. If you insert photo to note, it always too big.