Adding visuals will come to Napkin, but not very soon. A workaround that helps many users is...

a) take a photo with your phone, generate a sharable link (e.g. iCloud) and add the link to the note in Napkin.

b) take a photo, use your iPhones OCR function to identify the text (works even with handwritten notes) and send the transformed text to Napkin via iOS Shortcut or soon via Napkin Collect.

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Let us know how it works and/or if you find a better solution. 🤓