diff --git a/server/index.js b/server/index.js
index a6012e0..28d18df 100644
--- a/server/index.js
+++ b/server/index.js
@@ -36,6 +36,9 @@ const vaultRoutes = require("./routes/vault");
 app.use("/api/fs", fsRoutes);
 app.use("/api/vault", vaultRoutes);
 
+// Serve vault files for resource URLs (images, attachments, etc.)
+app.use("/vault-files", express.static(config.vaultPath));
+
 // --- Static serving ---
 // Serve the built shim-loader.js
 app.use(
diff --git a/shims/electron/index.js b/shims/electron/index.js
index feda1d8..08ac557 100644
--- a/shims/electron/index.js
+++ b/shims/electron/index.js
@@ -10,6 +10,13 @@ export const electronShim = {
   webFrame,
   remote: remoteShim,
 
+  // electron.webUtils  -  used for drag/drop file path extraction (desktop only)
+  webUtils: {
+    getPathForFile(file) {
+      return "";
+    },
+  },
+
   // electron.deprecate  -  used by Obsidian to mark deprecated APIs
   deprecate: {
     function(fn, name) {
diff --git a/shims/electron/ipc-renderer.js b/shims/electron/ipc-renderer.js
index ee6e095..949f609 100644
--- a/shims/electron/ipc-renderer.js
+++ b/shims/electron/ipc-renderer.js
@@ -25,7 +25,7 @@ const syncHandlers = {
   vault: () => window.__vaultConfig || { id: "default-vault", path: "/" },
   version: () => "1.8.9",
   "is-dev": () => false,
-  "file-url": () => "",
+  "file-url": () => "/vault-files/",
   "disable-update": () => true,
   update: () => "",
   "disable-gpu": () => false,
@@ -49,7 +49,20 @@ const syncHandlers = {
 export const ipcRenderer = {
   send(channel, ...args) {
     console.log("[shim:ipcRenderer] send:", channel, args);
-    // TODO: route to server via chosen sync mechanism if needed
+
+    // context-menu: Obsidian sends this and waits (up to 1s) for a response.
+    // In Electron, the main process returns spell-check info + edit flags.
+    // We reply immediately with a response object so Obsidian proceeds to
+    // build and show its HTML context menu without delay.
+    if (channel === "context-menu") {
+      queueMicrotask(() =>
+        ipcRenderer._emit("context-menu", {
+          webContentsId: 1,
+          editFlags: { canCut: true, canCopy: true, canPaste: true },
+        }),
+      );
+      return;
+    }
   },
 
   sendSync(channel, ...args) {
diff --git a/shims/electron/remote/index.js b/shims/electron/remote/index.js
index 0e8ad03..c2f7c2f 100644
--- a/shims/electron/remote/index.js
+++ b/shims/electron/remote/index.js
@@ -1,18 +1,18 @@
 // @electron/remote shim
 // Returned when Obsidian calls: window.require('@electron/remote')
 
-import { clipboardShim } from './clipboard.js';
-import { shellShim } from './shell.js';
-import { dialogShim } from './dialog.js';
-import { menuShim, menuItemShim } from './menu.js';
-import { appShim } from './app.js';
-import { windowShim, webContentsShim } from './window.js';
-import { themeShim } from './theme.js';
-import { sessionShim } from './session.js';
-import { systemPreferencesShim } from './system-preferences.js';
-import { screenShim } from './screen.js';
-import { nativeImageShim } from './native-image.js';
-import { notificationShim } from './notification.js';
+import { clipboardShim } from "./clipboard.js";
+import { shellShim } from "./shell.js";
+import { dialogShim } from "./dialog.js";
+import { menuShim, menuItemShim } from "./menu.js";
+import { appShim } from "./app.js";
+import { windowShim, webContentsShim } from "./window.js";
+import { themeShim } from "./theme.js";
+import { sessionShim } from "./session.js";
+import { systemPreferencesShim } from "./system-preferences.js";
+import { screenShim } from "./screen.js";
+import { nativeImageShim } from "./native-image.js";
+import { notificationShim } from "./notification.js";
 
 export const remoteShim = {
   clipboard: clipboardShim,
@@ -33,6 +33,8 @@ export const remoteShim = {
     return windowShim._current();
   },
 
+  webContents: webContentsShim,
+
   getCurrentWebContents() {
     return webContentsShim._current();
   },
diff --git a/shims/electron/remote/window.js b/shims/electron/remote/window.js
index 818b129..3bcd41d 100644
--- a/shims/electron/remote/window.js
+++ b/shims/electron/remote/window.js
@@ -135,6 +135,7 @@ const currentWindow = {
 };
 
 const currentWebContents = {
+  id: 1,
   _zoomLevel: 0,
 
   get zoomLevel() {
@@ -182,7 +183,25 @@ const currentWebContents = {
 
   undo() {},
   redo() {},
-  pasteAndMatchStyle() {},
+  cut() {
+    document.execCommand("cut");
+  },
+  copy() {
+    document.execCommand("copy");
+  },
+  paste() {
+    document.execCommand("paste");
+  },
+  pasteAndMatchStyle() {
+    document.execCommand("paste");
+  },
+  replaceMisspelling(word) {},
+
+  session: {
+    availableSpellCheckerLanguages: [],
+    setSpellCheckerLanguages(langs) {},
+    addWordToSpellCheckerDictionary(word) {},
+  },
 
   setSpellCheckerLanguages(langs) {},
 
@@ -212,4 +231,7 @@ export const windowShim = {
 
 export const webContentsShim = {
   _current: () => currentWebContents,
+  fromId(id) {
+    return id === currentWebContents.id ? currentWebContents : null;
+  },
 };
diff --git a/shims/fs/promises.js b/shims/fs/promises.js
index a9be4ff..c825bd1 100644
--- a/shims/fs/promises.js
+++ b/shims/fs/promises.js
@@ -24,20 +24,39 @@ export function createFsPromises(metadataCache, contentCache, transport) {
       if (meta && meta.type === "file") {
         return [];
       }
+      // If path not in cache at all (and not root), it doesn't exist
+      if (!meta && path && path !== "/" && path !== ".") {
+        const e = new Error(
+          `ENOENT: no such file or directory, scandir '${path}'`,
+        );
+        e.code = "ENOENT";
+        throw e;
+      }
       // Serve from metadata cache
       const entries = metadataCache.readdir(path);
-      if (entries.length > 0) {
-        return entries.map((e) => e.name);
-      }
-      // Fallback to server
-      const serverEntries = await transport.readdir(path);
-      return serverEntries.map((e) => e.name);
+      return entries.map((e) => e.name);
     },
 
     async readFile(path, encoding) {
       if (typeof encoding === "object") encoding = encoding?.encoding;
       const wantText = encoding === "utf8" || encoding === "utf-8";
 
+      // Short-circuit: reading a directory is an error
+      const meta = metadataCache.get(path);
+      if (meta && meta.type === "directory") {
+        const e = new Error("EISDIR: illegal operation on a directory, read");
+        e.code = "EISDIR";
+        throw e;
+      }
+      // Short-circuit: file not in metadata cache → doesn't exist
+      if (!meta && path) {
+        const e = new Error(
+          `ENOENT: no such file or directory, open '${path}'`,
+        );
+        e.code = "ENOENT";
+        throw e;
+      }
+
       // Check content cache
       const cached = contentCache.get(path);
       if (cached !== null) {
@@ -142,7 +161,11 @@ export function createFsPromises(metadataCache, contentCache, transport) {
 
     async access(path) {
       if (metadataCache.has(path)) return;
-      await transport.access(path);
+      const e = new Error(
+        `ENOENT: no such file or directory, access '${path}'`,
+      );
+      e.code = "ENOENT";
+      throw e;
     },
 
     async realpath(path) {
diff --git a/shims/fs/sync.js b/shims/fs/sync.js
index ceb6dc3..f98165a 100644
--- a/shims/fs/sync.js
+++ b/shims/fs/sync.js
@@ -10,8 +10,10 @@ export function createFsSync(metadataCache, contentCache, transport) {
     statSync(path) {
       const stat = metadataCache.toStat(path);
       if (!stat) {
-        const err = new Error(`ENOENT: no such file or directory, stat '${path}'`);
-        err.code = 'ENOENT';
+        const err = new Error(
+          `ENOENT: no such file or directory, stat '${path}'`,
+        );
+        err.code = "ENOENT";
         throw err;
       }
       return stat;
@@ -19,39 +21,52 @@ export function createFsSync(metadataCache, contentCache, transport) {
 
     accessSync(path, mode) {
       if (!metadataCache.has(path)) {
-        const err = new Error(`ENOENT: no such file or directory, access '${path}'`);
-        err.code = 'ENOENT';
+        const err = new Error(
+          `ENOENT: no such file or directory, access '${path}'`,
+        );
+        err.code = "ENOENT";
         throw err;
       }
     },
 
     readFileSync(path, encoding) {
-      if (typeof encoding === 'object') encoding = encoding?.encoding;
+      if (typeof encoding === "object") encoding = encoding?.encoding;
+
+      // Short-circuit: reading a directory is an error
+      const meta = metadataCache.get(path);
+      if (meta && meta.type === "directory") {
+        const e = new Error("EISDIR: illegal operation on a directory, read");
+        e.code = "EISDIR";
+        throw e;
+      }
 
       // Try content cache first
       const cached = contentCache.get(path);
       if (cached !== null) {
-        if (encoding === 'utf8' || encoding === 'utf-8') {
-          return typeof cached === 'string' ? cached : new TextDecoder().decode(cached);
+        if (encoding === "utf8" || encoding === "utf-8") {
+          return typeof cached === "string"
+            ? cached
+            : new TextDecoder().decode(cached);
         }
         return cached;
       }
 
       // Fallback: synchronous XHR
-      console.warn('[shim:fs] readFileSync cache miss, using sync XHR:', path);
+      console.warn("[shim:fs] readFileSync cache miss, using sync XHR:", path);
       const data = transport.readFileSync(path, encoding);
       contentCache.set(path, data);
       return data;
     },
 
     writeFileSync(path, data, encoding) {
-      if (typeof encoding === 'object') encoding = encoding?.encoding;
+      if (typeof encoding === "object") encoding = encoding?.encoding;
 
       // Write to cache immediately (sync return)
       contentCache.set(path, data);
-      const size = typeof data === 'string' ? data.length : (data.byteLength || 0);
+      const size =
+        typeof data === "string" ? data.length : data.byteLength || 0;
       metadataCache.set(path, {
-        type: 'file',
+        type: "file",
         size,
         mtime: Date.now(),
         ctime: metadataCache.get(path)?.ctime || Date.now(),
@@ -59,7 +74,11 @@ export function createFsSync(metadataCache, contentCache, transport) {
 
       // Fire-and-forget async send to server
       transport.writeFile(path, data, encoding).catch((e) => {
-        console.error('[shim:fs] writeFileSync background save failed:', path, e);
+        console.error(
+          "[shim:fs] writeFileSync background save failed:",
+          path,
+          e,
+        );
       });
     },
 
@@ -67,15 +86,21 @@ export function createFsSync(metadataCache, contentCache, transport) {
       contentCache.delete(path);
       metadataCache.delete(path);
 
-      // Fire-and-forget
+      // Fire-and-forget  -  suppress ENOENT (file already gone, e.g. .OBSIDIANTEST race)
       transport.unlink(path).catch((e) => {
-        console.error('[shim:fs] unlinkSync background delete failed:', path, e);
+        if (e.code !== "ENOENT") {
+          console.error(
+            "[shim:fs] unlinkSync background delete failed:",
+            path,
+            e,
+          );
+        }
       });
     },
 
     readdirSync(path) {
       const entries = metadataCache.readdir(path);
-      return entries.map(e => e.name);
+      return entries.map((e) => e.name);
     },
   };
 }
diff --git a/shims/fs/transport.js b/shims/fs/transport.js
index a425260..9d26181 100644
--- a/shims/fs/transport.js
+++ b/shims/fs/transport.js
@@ -10,6 +10,16 @@ function normPath(p) {
   return (p || "").replace(/^\/+/, "");
 }
 
+// Convert a Uint8Array to base64 without blowing the stack
+function uint8ToBase64(bytes) {
+  let binary = "";
+  const chunk = 8192;
+  for (let i = 0; i < bytes.length; i += chunk) {
+    binary += String.fromCharCode.apply(null, bytes.subarray(i, i + chunk));
+  }
+  return btoa(binary);
+}
+
 async function request(method, endpoint, params = {}) {
   const url = new URL(API_BASE + endpoint, window.location.origin);
 
@@ -109,7 +119,7 @@ export const transport = {
     const isText = typeof content === "string";
     return requestJson("POST", "/writeFile", {
       path: normPath(path),
-      content: isText ? content : btoa(String.fromCharCode(...content)),
+      content: isText ? content : uint8ToBase64(content),
       encoding: encoding || (isText ? "utf-8" : "binary"),
       base64: !isText,
     });
@@ -197,7 +207,7 @@ export const transport = {
     const isText = typeof content === "string";
     requestSync("POST", "/writeFile", {
       path: normPath(path),
-      content: isText ? content : btoa(String.fromCharCode(...content)),
+      content: isText ? content : uint8ToBase64(content),
       encoding: encoding || (isText ? "utf-8" : "binary"),
       base64: !isText,
     });
diff --git a/shims/loader.js b/shims/loader.js
index 879bced..960deb9 100644
--- a/shims/loader.js
+++ b/shims/loader.js
@@ -119,6 +119,19 @@ window.close = function () {
   console.log("[obsidian-bridge] window.close() blocked");
 };
 
+// Suppress the browser's native context menu without breaking Obsidian's.
+// Problem: preventDefault() blocks the browser menu but also sets
+// event.defaultPrevented=true, which Obsidian checks to bail out.
+// Solution: call preventDefault() then shadow defaultPrevented to return false.
+window.addEventListener(
+  "contextmenu",
+  (e) => {
+    e.preventDefault();
+    Object.defineProperty(e, "defaultPrevented", { get: () => false });
+  },
+  true,
+);
+
 // Pre-populate fs metadata cache synchronously before app.js runs.
 // This ensures existsSync() works for the vault path during startup.
 (function initMetadataCache() {