dSYMs (debug symbol files) are essential for symbolicating crash reports in iOS/macOS apps. When an app depends on a closed-source SDK, crashes originating from that SDK appear as unreadable hex addresses without the SDK's dSYMs. This guide explains what dSYMs are, how SDK vendors can generate them by adding DEBUG_INFORMATION_FORMAT=dwarf-with-dsym to their xcodebuild archive command, and how app developers can manually add third-party dSYMs to an Xcode archive before uploading to App Store Connect to get fully symbolicated crash reports.
