diff --git a/v2/internal/helpers/helpers.go b/v2/internal/helpers/helpers.go
index 3b7d31c..b28d371 100644
--- a/v2/internal/helpers/helpers.go
+++ b/v2/internal/helpers/helpers.go
@@ -300,11 +300,14 @@ func GetFileForFileUpload(request common.FileUploadRequest) (*os.File, error) {
 		return file, nil
 	}
 	if request.Base64 != "" {
+		if request.FileName == "" {
+			return nil, fmt.Errorf("FileName is required when Base64 is provided")
+		}
 		data, err := base64.StdEncoding.DecodeString(request.Base64)
 		if err != nil {
 			return nil, fmt.Errorf("failed to decode base64: %w", err)
 		}
-		file, err := os.Create(request.FileName)
+		file, err := os.CreateTemp("", request.FileName)
 		if err != nil {
 			return nil, fmt.Errorf("failed to create file: %w", err)
 		}
@@ -318,7 +321,7 @@ func GetFileForFileUpload(request common.FileUploadRequest) (*os.File, error) {
 		file.Seek(0, io.SeekStart)
 
 		// Remove from disk but keep open
-		os.Remove(request.FileName)
+		os.Remove(file.Name())
 		return file, nil
 	}
 
diff --git a/v2/internal/helpers/helpers_test.go b/v2/internal/helpers/helpers_test.go
index 5c499f5..6eec54f 100644
--- a/v2/internal/helpers/helpers_test.go
+++ b/v2/internal/helpers/helpers_test.go
@@ -819,7 +819,7 @@ MIIBAAIBADANINVALIDKEY==
 				Expect(err).To(BeNil())
 			})
 			It("should return error for invalid base64 data", func() {
-				_, err := GetFileForFileUpload(common.FileUploadRequest{Base64: "invalid_base64"})
+				_, err := GetFileForFileUpload(common.FileUploadRequest{Base64: "invalid_base64", FileName: "test.txt"})
 				Expect(err).ToNot(BeNil())
 				Expect(err.Error()).To(ContainSubstring("illegal base64 data at input byte"))
 			})