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+{
+  "id": "06-files-cloud",
+  "title": "Files, editor, WebDAV",
+  "icon": "☁",
+  "level": "intermediate",
+  "lessons": [
+    {
+      "id": "6.1",
+      "title": "Edit and compare files",
+      "objective": "Use the editor and diff tools on the VFS.",
+      "minutes": 9,
+      "commands": [
+        "edit",
+        "diff",
+        "find",
+        "files"
+      ],
+      "blocks": [
+        {
+          "type": "text",
+          "text": "`edit` opens the VFS editor. `diff` compares two files. `find` searches names; `filemgr` opens the visual browser."
+        },
+        {
+          "type": "cmd",
+          "text": "edit hello.txt"
+        },
+        {
+          "type": "cmd",
+          "text": "find hello"
+        },
+        {
+          "type": "cmd",
+          "text": "diff hello.txt hello.txt"
+        },
+        {
+          "type": "tip",
+          "text": "The editor calls the tutorial/file-saved hook, so exercise progress can be detected from a save."
+        },
+        {
+          "type": "cmd",
+          "text": "files"
+        }
+      ],
+      "exercise": {
+        "instruction": "Search for your file by name.",
+        "accept": [
+          "find hello",
+          "find hello.txt"
+        ],
+        "check": {
+          "type": "command"
+        },
+        "hint": "Type: find hello"
+      },
+      "quiz": {
+        "q": "Which command opens the visual file manager?",
+        "options": [
+          "filemgr",
+          "ls",
+          "cat"
+        ],
+        "answer": 0
+      },
+      "sources": [
+        "modules/ext/editor.js",
+        "modules/ext/diff.js",
+        "modules/ext/filemgr.js"
+      ]
+    },
+    {
+      "id": "6.2",
+      "title": "Cloud sync and login",
+      "objective": "Understand WebDAV auth, the space token, and the 401 self-heal path.",
+      "minutes": 14,
+      "commands": [
+        "webdav-login",
+        "webdav-config",
+        "webdav-status",
+        "webdav-push",
+        "webdav-backup"
+      ],
+      "blocks": [
+        {
+          "type": "text",
+          "text": "WebDAV syncs your VFS to your space. The module holds a SPACE token, not your personal token; it refreshes on 401."
+        },
+        {
+          "type": "cmd",
+          "text": "webdav-status"
+        },
+        {
+          "type": "cmd",
+          "text": "webdav-login"
+        },
+        {
+          "type": "warn",
+          "text": "Sessions do not cross browser contexts. If a push 401s, run `webdav-login` in THIS browser, then retry."
+        },
+        {
+          "type": "cmd",
+          "text": "webdav-push"
+        },
+        {
+          "type": "cmd",
+          "text": "webdav-backup"
+        }
+      ],
+      "exercise": {
+        "instruction": "Check the WebDAV status.",
+        "accept": [
+          "webdav-status"
+        ],
+        "check": {
+          "type": "command"
+        },
+        "hint": "Type: webdav-status"
+      },
+      "quiz": {
+        "q": "A 401 push usually means…",
+        "options": [
+          "the file is too big",
+          "no session/token in this browser context",
+          "WebDAV is disabled"
+        ],
+        "answer": 1
+      },
+      "sources": [
+        "modules/ext/webdav.js"
+      ]
+    }
+  ]
+}
+\ No newline at end of file