Update app.py

app.py

@@ -704,7 +704,7 @@ HTML_CONTENT = """
         function saveToHistory(fileName, url) {
             let history = JSON.parse(localStorage.getItem('uploadHistory')) || [];
             history.unshift({ fileName, url, timestamp: new Date().toISOString() });
-            if (history.length > 50) history = history.slice(0, 50);
+            if (history.length > 500) history = history.slice(0, 500);
             localStorage.setItem('uploadHistory', JSON.stringify(history));
         }