diff --git a/api.planx.uk/modules/file/service/uploadFile.ts b/api.planx.uk/modules/file/service/uploadFile.ts
index ead3cee9af..a6ee74227b 100644
--- a/api.planx.uk/modules/file/service/uploadFile.ts
+++ b/api.planx.uk/modules/file/service/uploadFile.ts
@@ -79,9 +79,9 @@ export function generateFileParams(
     ACL: "public-read",
     Bucket: process.env.AWS_S3_BUCKET,
     Key: key,
-    Body: file.buffer,
+    Body: file.buffer || JSON.stringify(file),
     ContentDisposition: `inline;filename="${filename}"`,
-    ContentType: file.mimetype,
+    ContentType: file.mimetype || "application/json",
   };
 
   return {