Case Sensitive Filesystems and Steam on macOS
Steam requires that ~/Library/Application Support/Steam be created on a case insensitive filesystem
Steam requires that ~/Documents/Steam Content be created on a case insensitive filesystem.
Case sensitive filesystems and partitions are not supported by Steam. Valve recommends that you have both Steam and your user folder installed on case-insensitive partitions or hard drives.
You can check whether you have a case-sensitive partition by doing the following;
- Open Terminal
- Type diskutil info /
- Press the Enter button
- Scroll down to File System Personality
If case-sensitive, the output will mention Case-sensitive Journaled HFS. If case-sensitivity is not specified, you are using a case-insensitive partition.