If a directory has multiple words in it I usually do kebab case: i-like-mine-in-a-way-i-can-read-them-properly. Both easier to read and type than pascal case.

For more complex filenames I use a combination of kebab-case and snake_case, where the underscore separates portions of the file name and kebab-case the parts of those portions. E.g. movie-title_release-date-or-year_technical-specifications.mp4