diff --git a/assets/creator-studio/src/editor-runtime.ts b/assets/creator-studio/src/editor-runtime.ts
index ddda5df5..9b2caecc 100644
--- a/assets/creator-studio/src/editor-runtime.ts
+++ b/assets/creator-studio/src/editor-runtime.ts
@@ -118,6 +118,39 @@ export function syncEditorHeight(editor: any): void {
 	iframe.setAttribute('scrolling', 'no');
 }
 
+/**
+ * 图片 / 视频落地是异步的：插入那一刻高度按 0 计算，资源加载完成后正文才真正
+ * 变高。这里在 iframe 内监听资源加载与尺寸变化，加载完成后重新同步一次，
+ * 否则图片下方的段落会被 iframe 的固定高度裁掉。
+ *
+ * 只在 body 上挂一次（installBlockActions 同一条 init 路径），避免重复监听。
+ */
+export function installHeightWatchers(editor: any): void {
+	const doc = editor?.getDoc?.();
+	if (!doc || !doc.body || (doc.body as any).__jioHeightWatched) {
+		return;
+	}
+	(doc.body as any).__jioHeightWatched = true;
+
+	// load 不冒泡，但捕获阶段能收到 img / iframe / video 的加载完成。
+	doc.body.addEventListener(
+		'load',
+		(event: Event) => {
+			const target = event.target as HTMLElement | null;
+			const tag = target?.tagName;
+			if (tag === 'IMG' || tag === 'IFRAME' || tag === 'VIDEO' || tag === 'AUDIO') {
+				syncEditorHeight(editor);
+			}
+		},
+		true
+	);
+
+	// 图片 CSS 生效后的尺寸变化、以及响应式重排，都由 ResizeObserver 兜底。
+	if (typeof (window as any).ResizeObserver === 'function') {
+		new (window as any).ResizeObserver(() => syncEditorHeight(editor)).observe(doc.body);
+	}
+}
+
 /** 块选中状态写在块自身的 class 上，跨 iframe 重排也能保留。 */
 const SELECTED_CLASS = 'jio-creator__block-selected';
 
diff --git a/assets/creator-studio/src/index.tsx b/assets/creator-studio/src/index.tsx
index 07dc84e0..56679c64 100644
--- a/assets/creator-studio/src/index.tsx
+++ b/assets/creator-studio/src/index.tsx
@@ -39,6 +39,7 @@ import { BlockDialog, type BlockDialogKind, type BlockDialogResult } from './com
 import { type Draft, type Limits, initialDraft } from './draft';
 import {
 	installBlockActions,
+	installHeightWatchers,
 	removeAdjacentBlock,
 	syncEditorHeight,
 } from './editor-runtime';
@@ -445,6 +446,7 @@ function Studio(): JSX.Element {
 						}
 						syncEditorHeight(editor);
 						installBlockActions(editor);
+						installHeightWatchers(editor);
 						updateHistoryAvailability(editor);
 						updateFormatValue(editor);
 						updateBlockValue(editor);
@@ -453,7 +455,7 @@ function Studio(): JSX.Element {
 						updateFormatValue(editor);
 						updateBlockValue(editor);
 					});
-					editor.on('input change Undo Redo AddUndo', () => {
+					editor.on('input change Undo Redo AddUndo SetContent', () => {
 						updateContent(serializeBlocks(editor.getContent()));
 						updateHistoryAvailability(editor);
 						syncEditorHeight(editor);
@@ -492,7 +494,13 @@ function Studio(): JSX.Element {
 					// 快照存的是保存格式（pre > code），编辑器要可编辑的形态。
 					const content = hydrateBlocks(parsed.content);
 					if (editorReadyRef.current) {
-						editorRef.current?.setContent(content);
+						const editor = editorRef.current;
+						editor?.setContent(content);
+						// setContent 不在 height 监听的事件列表里：正文一口气变长后
+						// iframe 会停在原来的高度，恢复出来的长文只剩开头几段可见。
+						if (editor && !editor.removed) {
+							syncEditorHeight(editor);
+						}
 					} else {
 						pendingRestoreContentRef.current = content;
 					}
@@ -752,6 +760,9 @@ function Studio(): JSX.Element {
 					target.nodeChanged();
 					updateContent(serializeBlocks(target.getContent()));
 					updateHistoryAvailability(target);
+					// 图片/视频按加载后的尺寸撑高正文；插入瞬间先同步一次，
+					// 资源落地后由 installHeightWatchers 的 load 监听再补一次。
+					syncEditorHeight(target);
 				}
 			},
 			onEmbed: (html: string) => {
@@ -761,6 +772,7 @@ function Studio(): JSX.Element {
 					target.nodeChanged();
 					updateContent(serializeBlocks(target.getContent()));
 					updateHistoryAvailability(target);
+					syncEditorHeight(target);
 				}
 			},
 		});
diff --git a/tests/widget-system/creator-studio-contract.test.cjs b/tests/widget-system/creator-studio-contract.test.cjs
index f57f0b74..23225aab 100644
--- a/tests/widget-system/creator-studio-contract.test.cjs
+++ b/tests/widget-system/creator-studio-contract.test.cjs
@@ -137,7 +137,7 @@ test('studio app uses TinyMCE while preserving autosave, recovery, and publishin
 	assert.match(appSource, /PublishDrawer/);
 	assert.match(appSource, /wpEditor\.initialize\(EDITOR_ID/);
 	assert.match(appSource, /editor\.getContent\(\)/);
-	assert.match(appSource, /editorRef\.current\?\.setContent/);
+	assert.match(appSource, /editor\?\.setContent\(content\)/);
 	assert.doesNotMatch(appSource, /BlockEditorProvider|registerCoreBlocks|BlockList|registerCoreBlocks/);
 	assert.doesNotMatch(creatorRest, /block_content\(/);
 	assert.match(creatorRest, /'post_content'\s*=>\s*\$payload\['content'\]/);
@@ -774,3 +774,38 @@ test('draft saves never demote a submitted post or consume the publish quota', (
 	// REST 侧要把 autosave 传给 persist()。
 	assert.match(read('src/Core/CreatorRest.php'), /'autosave'\s*=>\s*\$is_auto/);
 });
+
+// 恢复本地草稿会一次性把正文换成很长的一篇：iframe 必须跟着变高，
+// 否则超出的段落留在 iframe 内部滚动区，看起来像「只剩第一段」。
+test('restoring a draft resyncs the editor height', () => {
+	const app = read('assets/creator-studio/src/index.tsx');
+	const restoreAt = app.indexOf('const restore = useCallback');
+	const restoreBody = app.slice(restoreAt, app.indexOf('const rememberSelection'));
+
+	// setContent 之后必须重新同步高度。
+	assert.match(restoreBody, /editor\?\.setContent\(content\)/);
+	assert.match(restoreBody, /syncEditorHeight\(editor\)/);
+	// SetContent 事件本身也要参与高度同步与内容同步。
+	assert.match(app, /editor\.on\('input change Undo Redo AddUndo SetContent'/);
+});
+
+// 图片/视频插入后正文会变高，且资源是异步加载的：高度必须跟着重算，
+// 否则图片下方的段落会被 iframe 的固定高度裁掉。
+test('media inserts resync the editor height, including after async loading', () => {
+	const app = read('assets/creator-studio/src/index.tsx');
+	const runtime = read('assets/creator-studio/src/editor-runtime.ts');
+
+	// 两个媒体回调（选择器与嵌入）插入后都要同步高度。
+	const mediaAt = app.indexOf('const openMedia = useCallback');
+	const mediaBody = app.slice(mediaAt, app.indexOf('return (', mediaAt));
+	assert.equal((mediaBody.match(/syncEditorHeight\(target\)/g) || []).length, 2);
+
+	// 图片 / iframe / video 加载完成后补一次同步。
+	assert.match(runtime, /export function installHeightWatchers/);
+	assert.match(runtime, /addEventListener\(\s*'load'/);
+	assert.match(runtime, /tag === 'IMG' \|\| tag === 'IFRAME' \|\| tag === 'VIDEO' \|\| tag === 'AUDIO'/);
+	assert.match(runtime, /ResizeObserver/);
+	// 只在 init 路径挂一次，重复安装要短路。
+	assert.match(runtime, /__jioHeightWatched/);
+	assert.match(app, /installHeightWatchers\(editor\)/);
+});