diff --git a/.changeset/tui-paste-marker-steer-expand.md b/.changeset/tui-paste-marker-steer-expand.md
new file mode 100644
index 00000000000..fc862f21b62
--- /dev/null
+++ b/.changeset/tui-paste-marker-steer-expand.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Expand collapsed paste placeholders when steering the draft with Ctrl-S.
diff --git a/apps/kimi-code/src/tui/controllers/editor-keyboard.ts b/apps/kimi-code/src/tui/controllers/editor-keyboard.ts
index e4474e7425f..4284c2d3e50 100644
--- a/apps/kimi-code/src/tui/controllers/editor-keyboard.ts
+++ b/apps/kimi-code/src/tui/controllers/editor-keyboard.ts
@@ -308,7 +308,7 @@ export class EditorKeyboardController {
         host.state.appState.isCompacting
       )
         return;
-      const text = editor.getText().trim();
+      const text = (editor.getExpandedText?.() ?? editor.getText()).trim();
       const editorIsBash = editor.inputMode === 'bash';
 
       // Bash commands (`! …`) are not steerable: they stay queued so they run
diff --git a/apps/kimi-code/test/tui/controllers/editor-keyboard.test.ts b/apps/kimi-code/test/tui/controllers/editor-keyboard.test.ts
index 626728e7812..ebd1be0a433 100644
--- a/apps/kimi-code/test/tui/controllers/editor-keyboard.test.ts
+++ b/apps/kimi-code/test/tui/controllers/editor-keyboard.test.ts
@@ -473,6 +473,7 @@ describe('EditorKeyboardController Shift-Tab plan toggle', () => {
 describe('EditorKeyboardController Ctrl-S steering', () => {
   function createCtrlSHarness(options: {
     editorText: string;
+    editorExpandedText?: string;
     queued: Array<Record<string, unknown>>;
     engineV2?: boolean;
     skillCommandMap?: Map<string, string>;
@@ -488,6 +489,12 @@ describe('EditorKeyboardController Ctrl-S steering', () => {
       setText: setText as unknown as (...args: never[]) => unknown,
       inputMode: 'prompt' as unknown as (...args: never[]) => unknown,
     };
+    if (options.editorExpandedText !== undefined) {
+      const expanded = options.editorExpandedText;
+      editor['getExpandedText'] = vi.fn(() => expanded) as unknown as (
+        ...args: never[]
+      ) => unknown;
+    }
     const host = {
       state: {
         editor,
@@ -511,10 +518,11 @@ describe('EditorKeyboardController Ctrl-S steering', () => {
         closeOrCancel: vi.fn(() => false),
       },
     } as unknown as EditorKeyboardHost;
-    const controller = new EditorKeyboardController(
-      host,
-      undefined as unknown as ImageAttachmentStore,
-    );
+    const imageStore = {
+      get: vi.fn(() => undefined),
+      retainFileIds: vi.fn(),
+    } as unknown as ImageAttachmentStore;
+    const controller = new EditorKeyboardController(host, imageStore);
     controller.install();
     const onCtrlS = editor['onCtrlS'];
     if (onCtrlS === undefined) throw new Error('onCtrlS handler not installed');
@@ -648,4 +656,20 @@ describe('EditorKeyboardController Ctrl-S steering', () => {
     expect(setText).not.toHaveBeenCalled();
     expect(host.state.queuedMessages).toEqual([]);
   });
+
+  it('expands paste markers in the editor draft before steering', () => {
+    const longText = 'line\n'.repeat(15).trimEnd();
+    const { host, setText, steerMessage, onCtrlS } = createCtrlSHarness({
+      editorText: '[paste #1 +15 lines]',
+      editorExpandedText: longText,
+      queued: [],
+    });
+
+    onCtrlS();
+
+    expect(steerMessage).toHaveBeenCalledWith(host.session, [
+      { text: longText, parts: undefined, imageAttachmentIds: undefined },
+    ]);
+    expect(setText).toHaveBeenCalledWith('');
+  });
 });