Go to https://www.icloud.com/
Sign in with your Apple ID and password
On iPhone or iPad: Open the Settings app → tap your name → iCloud
On iPhone or iPad: Open the Settings app → iCloud
On iPhone or iPad: Open the iCloud Drive app (if available) or Files app → Browse → iCloud Drive
On a Mac: Open System Settings → Apple ID → iCloud
On a Mac: Open the Finder → iCloud Drive (or open Files app equivalent)
On Windows: Install iCloud for Windows → open iCloud app → sign in with your Apple ID
On Windows: Use File Explorer → iCloud Drive (if enabled)