diff --git a/feature_capabilities/src/main/ets/providers/ShareProvider.ets b/feature_capabilities/src/main/ets/providers/ShareProvider.ets
index a0d11f3..6bdc4bb 100644
--- a/feature_capabilities/src/main/ets/providers/ShareProvider.ets
+++ b/feature_capabilities/src/main/ets/providers/ShareProvider.ets
@@ -181,12 +181,14 @@ export class ShareProvider implements CapabilityProvider {
       this.startTextShare(bean, platform);
       return;
     }
-    cap(bean.sharetype).then((dataUrl: string) => {
+    // sharetype 不是 canvasId（原工程为"闲聊"二级字段），截图始终取默认首个 <canvas>，故传空串。
+    cap('').then((dataUrl: string) => {
+      this.log.i(`canvas captured dataUrlLen=${dataUrl.length}`);
       const filePath: string = dataUrl !== '' ? this.saveDataUrlToFile(ctx.uiAbilityContext, dataUrl) : '';
       if (filePath !== '') {
         this.onImageReady(bean, platform, filePath);
       } else {
-        this.log.w('canvas capture empty; fallback to text guide');
+        this.log.w('canvas capture empty (页面可能无 <canvas>); fallback to text guide');
         this.startTextShare(bean, platform);
       }
     }).catch((e: Error) => {