diff --git a/backend/handlers/onlyoffice.go b/backend/handlers/onlyoffice.go
index 95b8726..ee2802b 100644
--- a/backend/handlers/onlyoffice.go
+++ b/backend/handlers/onlyoffice.go
@@ -114,7 +114,15 @@ func (h *OnlyOfficeHandler) scheduleThumbnailUpdate(targetPath, relativePath str
 			return
 		}
 
-		h.DB.Exec("UPDATE files SET checksum = ?, size = ?, updated_at = CURRENT_TIMESTAMP WHERE path = ?", checksum, info.Size(), filepath.ToSlash(relativePath))
+		h.DB.Exec(`
+			INSERT INTO files (path, name, size, mime_type, checksum) 
+			VALUES (?, ?, ?, ?, ?) 
+			ON CONFLICT(path) DO UPDATE SET 
+				checksum=excluded.checksum, 
+				size=excluded.size, 
+				updated_at=CURRENT_TIMESTAMP`,
+			filepath.ToSlash(relativePath), filepath.Base(relativePath), info.Size(), mime.TypeByExtension(filepath.Ext(relativePath)), checksum,
+		)
 
 		workers.Instance.Enqueue(workers.ThumbnailJob{
 			FilePath: relativePath,
@@ -209,6 +217,9 @@ func (h *OnlyOfficeHandler) CreateBlank(c *fiber.Ctx) error {
 	// Return the relative path
 	relativePath, _ := filepath.Rel(h.Config.StorageDir, finalPath)
 	
+	// Enqueue for thumbnail generation (with 10s debounce)
+	h.scheduleThumbnailUpdate(finalPath, relativePath)
+	
 	return c.JSON(fiber.Map{
 		"path": filepath.ToSlash(relativePath),
 		"name": filepath.Base(finalPath),
@@ -270,6 +281,9 @@ func (h *OnlyOfficeHandler) CreateFromTemplate(c *fiber.Ctx) error {
 	}
 
 	relativePath, _ := filepath.Rel(h.Config.StorageDir, finalPath)
+	
+	h.scheduleThumbnailUpdate(finalPath, relativePath)
+
 	return c.JSON(fiber.Map{
 		"path": filepath.ToSlash(relativePath),
 		"name": filepath.Base(finalPath),