diff --git a/scanner/pages/emblemscanner/emblemscanner.js b/scanner/pages/emblemscanner/emblemscanner.js
index 002418d..220626f 100644
--- a/scanner/pages/emblemscanner/emblemscanner.js
+++ b/scanner/pages/emblemscanner/emblemscanner.js
@@ -24,7 +24,7 @@
 // - Special device rules: camera rules API can override with web_view: true
 // - no_web_view parameter can override web_view rules for testing
 
-// Import utility functions from library
+// Import utility functions fromsimplify api
 const {
   get_system_info,
   get_camera_rule,
@@ -78,6 +78,7 @@ Page({
     debug_image_data_url: '',
     debug_last_result: null,
     debug_current_frame_url: '', // Current frame being processed
+    logs: [], // Backend logging messages (like camera.js)
     qrtool_ready: false,
     // Frame processing statistics
     frames_processed: 0,
@@ -111,6 +112,10 @@ Page({
       return_page: options.return_page || '/pages/test_result_page/test_result_page',
       no_web_view: no_web_view
     });
+
+    // Log page load for backend reporting (like camera.js)
+    this.log("emblemscanner page load");
+    this.log("options", JSON.stringify(options));
   },
 
   fetchRealIP() {
@@ -145,7 +150,7 @@ Page({
     const systemInfo = get_system_info();
     const phone_model = systemInfo.model;
     const use_worker = phone_model.toLowerCase().includes("iphone");
-    
+
     this.setData({
       enable_debug,
       phone_model,
@@ -155,7 +160,11 @@ Page({
     });
 
     console.log(`Phone model: ${phone_model}, Use worker: ${use_worker}`);
-    
+
+    // Log system info for backend reporting (like camera.js)
+    this.log("phone model:", phone_model);
+    this.log("window width", systemInfo.windowWidth, "height", systemInfo.windowHeight);
+    this.log("use worker:", use_worker);
   },
 
   /**
@@ -713,7 +722,7 @@ Page({
     gd.image_data_urls = dataUrls;
     gd.qr_code = qrCode;
     
-    upload_image_data_urls(dataUrls, success, fail, "emblemscanner verification");
+    upload_image_data_urls(dataUrls, success, fail, this.data.logs.join("\n"));
   },
 
 
@@ -843,14 +852,28 @@ Page({
   },
 
   /**
-   * Add debug message to debug overlay
+   * Log function for backend reporting (like camera.js)
+   */
+  log(...what) {
+    console.log(...what);
+    this.setData({
+      logs: this.data.logs.concat([new Date() + ": " + what.join(" ")])
+    });
+  },
+
+  /**
+   * Add debug message to debug overlay and backend logs
    */
   addDebugMessage(message) {
+    // Always add to backend logs for reporting
+    this.log(message);
+
+    // Only show in debug overlay if debug is enabled
     if (!this.data.enable_debug) return;
-    
+
     const timestamp = new Date().toLocaleTimeString();
     const debugMsg = `${timestamp}: ${message}`;
-    
+
     this.setData({
       debug_msgs: [debugMsg, ...this.data.debug_msgs].slice(0, 5) // Keep first 5 messages (newest on top)
     });
@@ -910,6 +933,9 @@ Page({
   onShow() {
     console.log('EmblemScanner page shown - initializing');
 
+    // Log page show for backend reporting (like camera.js)
+    this.log("emblemscanner page show");
+
     // Reset state machine to initial state
     this.setData({
       app_state: 'loading_rules',
@@ -948,6 +974,23 @@ Page({
   onHide() {
     console.log('EmblemScanner page hidden - cleaning up');
     this.cleanupListener();
+
+    // Reset worker processing state to prevent stale state
+    this.setData({
+      worker_processing: false,
+      app_state: 'loading_rules',
+      busy: true
+    });
+
+    // Clear frame timing and image collection
+    this.lastFrameTime = 0;
+    this.image_data_urls = [];
+
+    // Clear logs to prevent memory buildup
+    this.setData({ logs: [] });
+
+    // Clear zoom function reference
+    this.on_first_qr_found = null;
   },
 
   /**
@@ -958,7 +1001,7 @@ Page({
   },
 
   /**
-   * Clean up camera frame listener
+   * Clean up camera frame listener and camera context
    */
   cleanupListener() {
     if (this.listener) {
@@ -966,6 +1009,15 @@ Page({
       this.listener = null;
       this.addDebugMessage('Camera frame listener stopped');
     }
+
+    // Clear camera context to prevent multiple camera elements
+    if (this.camera_context) {
+      this.camera_context = null;
+      this.addDebugMessage('Camera context cleared');
+    }
+
+    // Clean up worker state
+    this.cleanupWorkerState();
   },
 
   get_worker() {
@@ -974,6 +1026,23 @@ Page({
       gd.emblemscanner_worker = this.setupWorker();
     }
     return gd.emblemscanner_worker;
+  },
+
+  /**
+   * Clean up worker state without terminating the worker
+   */
+  cleanupWorkerState() {
+    if (this.data.use_worker) {
+      // Reset worker processing flag
+      this.setData({
+        worker_processing: false
+      });
+
+      // Clear stored worker frame reference
+      this.lastWorkerFrame = null;
+
+      this.addDebugMessage('Worker state cleaned up');
+    }
   }
 
 });
\ No newline at end of file