what is directory name for My Files in chromebook

The internal system directory path for "My Files" in ChromeOS is /home/chronos/user/MyFiles. [1]

Directory Details

User Profile Path: /home/chronos/user/MyFiles
Downloads Subfolder: /home/chronos/user/MyFiles/Downloads
Linux Sharing Mount: Shared folders from "My Files" appear in the Linux environment under /mnt/chromeos. [1, 2, 3]

If you are trying to access these files for a specific app, terminal command, or script, let me know what you are trying to do so I can give you the exact path or sharing steps.