diff --git a/diagnostic/index.html b/diagnostic/index.html
index 6155652..ff38df4 100644
--- a/diagnostic/index.html
+++ b/diagnostic/index.html
@@ -1252,30 +1252,49 @@
       sendToRVS_raw({ type: 'xtts_list_voices', payload: {}, timestamp: Date.now() });
     }
 
+    function arrayBufferToBase64(buffer) {
+      const bytes = new Uint8Array(buffer);
+      let binary = '';
+      for (let i = 0; i < bytes.length; i += 8192) {
+        binary += String.fromCharCode.apply(null, bytes.subarray(i, i + 8192));
+      }
+      return btoa(binary);
+    }
+
     async function uploadVoiceSamples() {
       const name = document.getElementById('xtts-clone-name').value.trim();
       const files = document.getElementById('xtts-clone-files').files;
       if (!name) { alert('Bitte einen Namen eingeben'); return; }
       if (!files || files.length === 0) { alert('Bitte Audio-Dateien auswaehlen'); return; }
+      if (files.length > 10) { alert('Maximal 10 Dateien'); return; }
 
-      document.getElementById('xtts-clone-status').textContent = `Lade ${files.length} Datei(en) hoch...`;
+      const status = document.getElementById('xtts-clone-status');
+      status.textContent = `Lade ${files.length} Datei(en)...`;
+      status.style.color = '#FFD60A';
 
-      const samples = [];
-      for (const file of files) {
-        const buffer = await file.arrayBuffer();
-        const base64 = btoa(String.fromCharCode(...new Uint8Array(buffer)));
-        samples.push({ base64, name: file.name, size: file.size });
+      try {
+        const samples = [];
+        for (let i = 0; i < files.length; i++) {
+          status.textContent = `Lese Datei ${i + 1}/${files.length}: ${files[i].name}...`;
+          const buffer = await files[i].arrayBuffer();
+          const base64 = arrayBufferToBase64(buffer);
+          samples.push({ base64, name: files[i].name, size: files[i].size });
+        }
+
+        const totalSize = samples.reduce((s, f) => s + f.size, 0);
+        status.textContent = `Sende ${samples.length} Sample(s) (${(totalSize / 1024).toFixed(0)}KB)...`;
+
+        sendToRVS_raw({
+          type: 'voice_upload',
+          payload: { name, samples },
+          timestamp: Date.now(),
+        });
+
+        status.textContent = `Gesendet — warte auf Bestaetigung vom XTTS-Server...`;
+      } catch (err) {
+        status.textContent = `Fehler: ${err.message}`;
+        status.style.color = '#FF3B30';
       }
-
-      const totalSize = samples.reduce((s, f) => s + f.size, 0);
-      document.getElementById('xtts-clone-status').textContent =
-        `Sende ${samples.length} Sample(s) (${(totalSize / 1024).toFixed(0)}KB) an XTTS-Server...`;
-
-      sendToRVS_raw({
-        type: 'voice_upload',
-        payload: { name, samples },
-        timestamp: Date.now(),
-      });
     }
 
     // ── Abbrechen ──────────────────────────────