Thanks for providing code. Could you kindly take further steps to make it easier for other forum users to help you? Share some representative data that will enable your code to run and show the problematic behaviour.
How do I share data for a reprex?
You might use tools such as the library datapasta, or the base function dput() to share a portion of data in code form, i.e. that can be copied from forum and pasted to R session.
Advice.
If your issue does not relate to file reading , i.e . You have no problem loading your raw data, your problem is manipulating/processing it, then you should modify your example to exclude all file loading code and substitute that code with example data that you prepared following the guide.