Why it's an issue?

Before judge file issue, let's learn some basic concept of data and file in Blueprism

https://www.youtube.com/watch?v=7S3hHErVo4U

It is really bothering if developer need to update a path in RPA. If you put all file path in the data item, you have to correct the new path one by one in different objects where stores in various pages.
If the process isn't too complicated, you can just store all file paths in data item and integrate to one page.

I find that some RPA developers take adavatage of environment variables as an approach to unify the paths so that you can prevent from missing scattered file paths

Environment variable

These are meant to be applicable to the entire installation of BluePrism. And they are useful to be used mainly for variables which u know will be changed in future (like URL, email id's etc) and you don't want to touch the code for such changes.
They can be defined in system manager tab and to use them you need to set the data item name exactly as the environment variable name and set the exposure to environment. It will pick up the value from environment variable.