diff --git a/TODO_NEXT_STEPS.txt b/TODO_NEXT_STEPS.txt
index a837674..f4c81f0 100644
--- a/TODO_NEXT_STEPS.txt
+++ b/TODO_NEXT_STEPS.txt
@@ -4,6 +4,7 @@
 ================================================================================
 
 【已完成】
+   - V10.208 修正 `/observability/ppt_audit_history` 同頁預覽抽屜 selector：Modal 標題改用獨立 `data-ppt-preview-modal-title`，避免與多個預覽連結的資料屬性衝突。
    - V10.207 強化 `/observability/ppt_audit_history` 同頁線上預覽：所有可預覽簡報按鈕改為開啟頁內 PDF 預覽抽屜，保留開新頁與下載，降低產線頁來回跳轉成本並改善手機操作。
    - V10.205 補 `/observability/ppt_audit_history` 本頁批次 PDF 預熱：Preview Workbench 可一鍵預熱頁面上尚未快取的 PPTX，沿用單檔 JSON 端點逐一建立 PDF 快取並即時更新狀態。
    - V10.203 補 `/observability/ppt_audit_history` 單檔 PDF 預熱操作：未快取的可預覽 PPTX 會顯示「預熱 PDF」，透過 JSON 端點建立 PDF 快取並即時更新頁面狀態。
diff --git a/config.py b/config.py
index ac2d705..66d6be4 100644
--- a/config.py
+++ b/config.py
@@ -320,7 +320,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.207"
+SYSTEM_VERSION = "V10.208"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 
diff --git a/templates/admin/ppt_audit_history.html b/templates/admin/ppt_audit_history.html
index 0261744..7126c02 100644
--- a/templates/admin/ppt_audit_history.html
+++ b/templates/admin/ppt_audit_history.html
@@ -611,7 +611,7 @@
     <header class="ppt-preview-head">
       <div>
         <div class="ppt-label">Inline PDF Preview</div>
-        <h2 id="pptPreviewTitle" data-ppt-preview-title>簡報線上預覽</h2>
+        <h2 id="pptPreviewTitle" data-ppt-preview-modal-title>簡報線上預覽</h2>
         <small class="text-muted" data-ppt-preview-filename>尚未選擇檔案</small>
       </div>
       <div class="ppt-preview-actions">
diff --git a/tests/test_admin_observability_routes.py b/tests/test_admin_observability_routes.py
index c42c1e3..beac011 100644
--- a/tests/test_admin_observability_routes.py
+++ b/tests/test_admin_observability_routes.py
@@ -281,6 +281,7 @@ def test_ppt_audit_history_shows_recent_preview_workbench(client, monkeypatch, t
     assert '線上預覽' in html
     assert 'data-ppt-open-preview' in html
     assert 'data-ppt-preview-modal' in html
+    assert 'data-ppt-preview-modal-title' in html
     assert 'data-ppt-preview-pdf' in html
     assert 'PDF 快取' in html
     assert '1</strong> 份 PDF 快取' in html
diff --git a/web/static/js/observability-charts.js b/web/static/js/observability-charts.js
index f4a5d77..e0f6664 100644
--- a/web/static/js/observability-charts.js
+++ b/web/static/js/observability-charts.js
@@ -598,7 +598,7 @@
     const pageStatus = document.querySelector('[data-ppt-auto-status]');
     const previewModal = document.querySelector('[data-ppt-preview-modal]');
     const previewFrame = previewModal ? previewModal.querySelector('[data-ppt-preview-frame]') : null;
-    const previewTitle = previewModal ? previewModal.querySelector('[data-ppt-preview-title]') : null;
+    const previewTitle = previewModal ? previewModal.querySelector('[data-ppt-preview-modal-title]') : null;
     const previewFilename = previewModal ? previewModal.querySelector('[data-ppt-preview-filename]') : null;
     const previewOpenPage = previewModal ? previewModal.querySelector('[data-ppt-preview-open-page]') : null;
     const previewDownload = previewModal ? previewModal.querySelector('[data-ppt-preview-download]') : null;