Error: Either the caller does not have the required permission or the specified path is read-only

I have created a console application which is programmed to consume a codeunit, which has been published. The codeunit runs a report for me in the classic client, which contains a file.CREATE, in order to produce a file when it has run successfully. On the tier server for classic client, the C# console app runs fine, but when run on a different server (same user) I get the error specified in the title. I need understanding why the permissions don't apply outside of the tier server, and a solution to this problem.

Thank you.