Thanks for the question. You're asking programming specific questions that are very general. The path that you are referring is actually what we call a "relative path". You can look at the answer to this question for an explanation of relative paths: Path to files.
Check out this link for a pretty explanation of using the ".." in your paths: absolute paths vs. relative paths.
To fix the issue you're having, try being a little more explicit with the path. Instead of just putting "../files/" try making it "/public_html/files/. You can also learn more about using paths in PHP here: Referencing files in PHP or here: How to set paths in PHP.
I hope this helps to provide the information that you seek. If you have any further questions or comments, please let us know.
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