Sphinx autodoc works locally but not on Read The Docs

I have a GitHub repo (here) which is extremely basic and only meant to reproduce a problem I had with another repo (CPU Health Checks also in my public repos)

It consists on a package called rtdtest which locally is a rtdtest/ folder with an empty __init__.py. This file has two simple modules cpu_health.py and utilities.py where cpu_health.py imports utilities.py with the statement

import rtdtest.utilities as utilities

In this case making a package is not that necessary but in my "real" repo I need it to access modules in subfolders within the proyect's root folder

My problem is that even though I am able to produce the documentation I want locally with sphinx which includes DocString generated documentation created with automodule statements in index.rst, when creating the documentation in Read The Docs the build passes but with warning messages

> WARNING: autodoc: failed to import module 'cpu_health' from module
> 'rtdtest'; the following exception was raised: No module named
> 'rtdtest' WARNING: autodoc: failed to import module 'utilities' from
> module 'rtdtest'; the following exception was raised: No module named
> 'rtdtest'

Saying the modules from the package were not imported and suggesting to me that RTD is not recognizing rtdtest as a package but as a module (although I could be wrong there)

Locally the package is found with the line

sys.path.insert(0, os.path.abspath('../..'))

In file conf.py (conf.py is 2 folders ahead of the root folder of the project in docs/sphinx/)

My (minimalistic) configuration files requirements.txt, .readthedocs.yml, setup.py, docs/sphinx/conf.py, and docs/sphinx/requirements.txt are included in the GitHub repo (couldn't put specific links because stackoverflow called the message spam)

And my main documentation file is:
index.rst

In the admin Advance Settings section of my repo I have checked the "Install Project" box to "Install your project inside a virtualenv using setup.py install" but I haven't checked other one. For documentation type I chose "Sphinx HTML"

I tried multiple times to edit my conf.py file to add folders to the path using sys.path.insert but no combination of current and parent folders worked.

I also tried replicating the solution proposed in this previous post who apparently had a very similar problem and was able to solve it, but even trying to mimic their configuration files didn't work

Does anyone now what might be the problem? I am sorry in advance if this is clearly stated in the RTD documentation but this is my first time using the tool and I couldn't find a solution there

Please let me know if there is any additional information I should provide to help solving the problem

Cheers and thanks
Felipe

The problem was solved thanks to @sinoroc suggestion and the project structure suggested presented in this packaging tutorial. The structure of the project was causing problems because I had the __init__.py file in the root of the project along with setup.py.

Apparently that also produced problems for installing the package in some computers so it was extremely important to fix it.

I just created a /src/rtdtest folder within the root of the package and shifted the .py files there. Then I updated the new package name in the module's import statement and .rst files, I also added lines "packages=find_packages('src')" and "package_dir={'':'src'}" to setup.py, and modified the .readthedocs.yml file to contain:

python:
  version: 3.8
  install:
    - method: pip
      path: .
      extra_requirements:
        - rtdtest

Now the build in ReadTheDocs worked fine, creating documentation from the module's DocStrings as expected