This is a Docker volume issue, not a code bug. The backend container only sees paths explicitly mounted in docker-compose.yml. A new mount on the Linux host (e.g. NAS share, USB drive) is invisible to the container until added as a volume — restarting the container alone doesn't help, and restarting just the host doesn't either. Backend: New GET /api/filebrowser/diagnose endpoint reads /proc/self/mountinfo and returns the actual bind/nfs/cifs mounts the container sees, plus a check of common candidate roots (/audiofiles, /mnt, /media, /srv, /home, /app/data) showing whether they exist and have content. Frontend: Info icon in FileBrowser header toggles a diagnose panel showing mounts and root candidates. Quick-access buttons now built dynamically from candidate roots that actually exist. On 'path not found' error: helpful inline explanation including the exact .env variable and docker-compose command needed to add a new mount. docker-compose.yml: New EXTRA_AUDIO_PATH env variable. Mounts a second host path 1:1 (same path inside container, like AUDIOFILES_PATH does). Defaults to ./data → /extra_audio_unused when unset, which is a no-op. .env.example: Documents EXTRA_AUDIO_PATH usage with example. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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