Sometimes we need to refer to something without knowing will it be singular or plural. How to write such things in formal writing?
Version 1
No valid input files found.
- Make sure the input field contains at least one ".adoc" file.
- Make sure this file (these files) does exist.
Version 2
No valid input files found.
- Make sure the input field contains at least one ".adoc" file.
- Make sure this file(s) does exist.
Or something different?