Pytest ordering of test suites

I've a set of test files (.py files) for different UI tests. I want to run these test files using pytest in a specific order. I used the below command

python -m pytest -vv -s --capture=tee-sys --html=report.html --self-contained-html ./Tests/test_transTypes.py ./Tests/test_agentBank.py ./Tests/test_bankacct.py

The pytest execution is triggered from an AWS Batch job. When the test executions happens it is not executing the test files in the order as specified in the above command. Instead it first runs test_agentBank.py followed by test_bankacct.py, then test_transTypes.py Each of these python files contains bunch of test functions.

I also tried decorating the test function class such as @pytest.mark.run(order=1) in the first python file(test_transTypes.py), @pytest.mark.run(order=2) in the 2nd python file(test_agentBank.py) etc. This seems to run the test in the order, but at the end I get a warning

 PytestUnknownMarkWarning: Unknown pytest.mark.run - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs
.pytest.org/en/stable/how-to/mark.html
    @pytest.mark.run(order=1)

What is the correct way of running tests in a specific order in pytest? Each of my "test_" python files are the ones I need to run using pytest.

Any help much appreciated.

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