Let's say, we are talking about folders in a computer. What is a correct way to refer to the names of multiple folders?
ex:
- Folder names are incorrect.
or
- Folders' names are incorrect.
What we are dealing with here in my understanding is the use of possessives in combination with compound nouns. According to this Grammar Tip, you should use Folders' names, since you have multiple folders "possessing" these names. Folder names would then be just one folder with multiple names.