Custom PDFs are not generated in the ReadTheDocs flyer menu

Here is my .readthedocs.yml file which includes commands to build PDF from simple-pdf extension. Although the build succeeds executing all the commands, I cant see the PDF in flyer menu.

# .readthedocs.yaml# Read the Docs configuration file# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details# Requiredversion: 2#submodules:#  include:#    - paamr-deployment# Set the version of Python and other tools you might needbuild:  os: ubuntu-20.04  tools:    python: "3.9"    # You can also specify other tool versions:    # nodejs: "16"    # rust: "1.55"    # golang: "1.17"  #Add custom simple-pdf to readthedocs flyer menu    commands:    - pip install -r docs/requirements.txt    - rm -rf _readthedocs/pdf    - mkdir -p _readthedocs/pdf    - sphinx-build -b simplepdf docs _readthedocs/pdf    - find _readthedocs/pdf -type f ! -name '*.pdf' -delete  # Delete all files except .pdf    - find _readthedocs/pdf -mindepth 1 -type d -delete  # Delete all directories except .pdf    - mkdir -p _readthedocs/html/    - sphinx-build -b html docs _readthedocs/html# Build documentation in the docs/ directory with Sphinxsphinx:  configuration: docs/conf.py# If using Sphinx, optionally build your docs in additional formats such as PDFformats: all# Optionally declare the Python requirements required to build your docspython:  install:    - requirements: docs/requirements.txt

Output:

• Readthedocs PR build passed
• Activated version build passed
• On clicking on PDF option on readthedocs flyer, it says 404

Expected output:

• Readthedocs PR build pass
• Activated version build passe
• On clicking on PDF option on readthedocs flyer, PDF should be downloaded