diff --git a/frontend/templates/index.html b/frontend/templates/index.html
index 131b0b5..004df90 100644
--- a/frontend/templates/index.html
+++ b/frontend/templates/index.html
@@ -152,6 +152,7 @@ async function handleUpload(formData) {
     xhr.setRequestHeader('X-VM-Name', vmName);
 
     xhr.upload.addEventListener('progress', (e) => {
+      console.log('progress', e.loaded, '/', e.total, 'computable:', e.lengthComputable);
       if (e.lengthComputable) {
         const pct = Math.round((e.loaded / e.total) * 100);
         setPhase('Uploading source file... ' + (e.loaded / (1024**3)).toFixed(1) + ' GiB', pct, false);
@@ -162,6 +163,7 @@ async function handleUpload(formData) {
     });
 
     xhr.addEventListener('loadstart', () => {
+      console.log('loadstart');
       setPhase('Uploading source file...', 0, true);
     });