diff --git a/services/mam-api/src/routes/upload.js b/services/mam-api/src/routes/upload.js
index 528d7e2..ae1d46f 100644
--- a/services/mam-api/src/routes/upload.js
+++ b/services/mam-api/src/routes/upload.js
@@ -83,6 +83,14 @@ async function syncToAmpp(assetId, projectId, binId) {
   }
 }
 
+// Derive a media_type string from a MIME type
+function mediaTypeFromMime(mime = '') {
+  if (mime.startsWith('video')) return 'video';
+  if (mime.startsWith('audio')) return 'audio';
+  if (mime.startsWith('image')) return 'image';
+  return 'document';
+}
+
 // POST /api/v1/upload/init - Initialize a multipart upload
 router.post('/init', async (req, res, next) => {
   try {
@@ -106,9 +114,7 @@ router.post('/init', async (req, res, next) => {
       VALUES ($1,$2,$3,$4,$4,'ingesting',$5,$6,$7,$8,NOW(),NOW())`,
       [
         assetId, projectId, binId || null, filename,
-        contentType.startsWith('video') ? 'video'
-          : contentType.startsWith('audio') ? 'audio'
-          : contentType.startsWith('image') ? 'image' : 'document',
+        mediaTypeFromMime(contentType),
         s3Key, fileSize,
         tagsArray.length > 0 ? tagsArray : null,
       ]
@@ -179,7 +185,11 @@ router.post('/complete', async (req, res, next) => {
         Key: key,
         UploadId: uploadId,
         MultipartUpload: {
-          Parts: parts.map(p => ({ ETag: p.etag, PartNumber: p.partNumber })),
+          // Accept both casings: api.js sends ETag (uppercase), defend against both
+          Parts: parts.map(p => ({
+            ETag: p.ETag || p.etag,
+            PartNumber: p.partNumber || p.PartNumber,
+          })),
         },
       })
     );
@@ -261,9 +271,7 @@ router.post('/simple', upload.single('file'), async (req, res, next) => {
       VALUES ($1,$2,$3,$4,$4,'ingesting',$5,$6,$7,$8,NOW(),NOW())`,
       [
         assetId, projectId, binId || null, filename,
-        mimeType.startsWith('video') ? 'video'
-          : mimeType.startsWith('audio') ? 'audio'
-          : mimeType.startsWith('image') ? 'image' : 'document',
+        mediaTypeFromMime(mimeType),
         s3Key, req.file.size,
         tagsArray.length > 0 ? tagsArray : null,
       ]