Attachments getting stripped

[sean-parent]

The following notebook losing the attachment when converting to markdown. Is there any way to preserve it? In JupyterLab this is not stored in the notebook or cell metadata.

stripped_attachment.md

---
jupyter:
  jupytext:
    formats: ipynb,md
    text_representation:
      extension: .md
      format_name: markdown
      format_version: '1.3'
      jupytext_version: 1.10.0
  kernelspec:
    display_name: Python 3
    language: python
    name: python3
---

Adding an attachment:
![image.png](attachment:c280a928-8f3f-4c05-9509-f74ac050f29e.png)

stripped_attachment.ipynb

{
 "cells": [
  {
   "attachments": {
    "c280a928-8f3f-4c05-9509-f74ac050f29e.png": {
     "image/png": "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"
    }
   },
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Adding an attachment:\n",
    "![image.png](attachment:c280a928-8f3f-4c05-9509-f74ac050f29e.png)"
   ]
  }
 ],
 "metadata": {
  "jupytext": {
   "formats": "ipynb,md"
  },
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.9.1"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}

[mwouts]

Hi @sean-parent , that is correct, attachments are not stored in the .md file, and we have no plans to change that, because it would make the .md file too large, and the diff less readable (sorry 😄 )

What you can do is either

• use explicit files rather than attachments
• or, preserve the attachment in an .ipynb file. If you use either jupytext --to ipynb --update, or jupytext --sync, the attachment should not be lost on round trips. This has been supported since Jupytext 1.7.0, cf. clipboard pasting image in jupyter notebook does not work when notebook is synced to .py file via jupytext #671

Hope that helps!