0.9.4

• New: Update all existing attachments with missing file sizes when the 'Remove Files From Server' option is enabled (automatically runs in the background)
• Improvement: Show when constants are used to set bucket and region options
• Improvement: Don't show compatibility notices on plugin update screen
• Improvement: On Multisite installs don't call restore_current_blog() on successive loop iterations
• Bug fix: 'Error getting URL preview' alert shown when enter key pressed on settings screen
• Bug fix: Unable to crop header images when the 'Remove Files From Server' option is enabled
• Bug fix: Incorrect storage space shown on Multisite installs when the 'Remove Files From Server' option is enabled
• Bug fix: Upload attempted to non existent bucket when defined by constant
• Bug fix: 'SignatureDoesNotMatch' error shown when using signed URLs with bucket names containing '.' characters