fix

backend/src/routes/documents.rs

@@ -1273,11 +1273,13 @@ pub async fn download_with_token(
 
     let storage = state.storage_for_tenant(claims.tenant_id)?;
 
+    let disposition = inline_content_disposition(&doc.filename);
+
     let presigned_url = storage
         .presign_get_object(
             &version.s3_key,
             Duration::from_secs(PRESIGNED_URL_EXPIRY_SECONDS),
-            None,
+            disposition.as_deref(),
         )
         .await
         .storage_context("failed to generate download URL")?;