diff --git a/backend/routes/ivantiFpWorkflow.js b/backend/routes/ivantiFpWorkflow.js
index 332abc5..15fe666 100644
--- a/backend/routes/ivantiFpWorkflow.js
+++ b/backend/routes/ivantiFpWorkflow.js
@@ -1050,8 +1050,10 @@ function createIvantiFpWorkflowRouter(db, requireAuth) {
                 for (const f of files) {
                     console.log('[attachFiles] Uploading:', f.originalname, 'size:', f.size);
                     try {
-                        const result = await ivantiMultipartPost(attachUrl, f.buffer, f.originalname, apiKey, skipTls);
-                        console.log('[attachFiles] Result for', f.originalname, '— status:', result.status);
+                        // Use ivantiFormPost with field name 'files' (same as create endpoint)
+                        const formFiles = [{ name: 'files', buffer: f.buffer, filename: f.originalname }];
+                        const result = await ivantiFormPost(attachUrl, [], formFiles, apiKey, skipTls);
+                        console.log('[attachFiles] Result for', f.originalname, '— status:', result.status, 'body:', (result.body || '').substring(0, 200));
                         const success = result.status === 200 || result.status === 201 || result.status === 202;
                         attachmentResults.push({ filename: f.originalname, success, ...(success ? {} : { error: `Upload failed: ${result.status}` }) });
                     } catch (uploadErr) {