diff --git a/web-to-ppt/background.js b/web-to-ppt/background.js
index d5f36db..5565ab1 100644
--- a/web-to-ppt/background.js
+++ b/web-to-ppt/background.js
@@ -173,11 +173,15 @@ chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
 
   // 下载 PPTX（从 storage 读取 base64）
   if (message?.type === "WEB_TO_PPT_DOWNLOAD") {
+    console.log("[WebToPPT] download handler triggered");
     (async () => {
       const stored = await chrome.storage.session.get(['pptxBase64', 'pptxFilename']);
+      console.log('[WebToPPT] stored keys:', Object.keys(stored), 'dataLen:', stored.pptxBase64?.length);
       if (!stored.pptxBase64) throw new Error('没有待下载的数据');
       const dataUrl = 'data:application/vnd.openxmlformats-officedocument.presentationml.presentation;base64,' + stored.pptxBase64;
+      console.log('[WebToPPT] calling downloads.download, url length:', dataUrl.length);
       await chrome.downloads.download({ url: dataUrl, filename: stored.pptxFilename });
+      console.log('[WebToPPT] download completed');
       await chrome.storage.session.remove(['pptxBase64', 'pptxFilename']);
       return { ok: true };
     })()