测试修复文件上传 bug

backend/internal/modules/file/service.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"fmt"
 	"io"
 	"mime/multipart"
 	"net/http"
@@ -56,7 +57,7 @@ func (s *Service) Upload(req uploadRequest) (*UploadDTO, error) {
 	if err := s.storage.PutObject(req.Context, key, bytes.NewReader(data), int64(len(data)), contentType, map[string]string{
 		"original-filename": req.Header.Filename,
 	}); err != nil {
-		return nil, err
+		return nil, fmt.Errorf("%w: %v", ErrDependencyUnavailable, err)
 	}
 	var thumbnailURL string
 	var mediumURL string