Add response content disposition to download with the correct filenames and extension

app/services/bulk_upload/downloader.rb

@@ -16,7 +16,11 @@ class BulkUpload::Downloader
   end
 
   def presigned_url
-    s3_storage_service.get_presigned_url(bulk_upload.identifier, 60)
+    s3_storage_service.get_presigned_url(
+      bulk_upload.identifier,
+      60,
+      response_content_disposition: "attachment; filename=#{bulk_upload.filename}.csv"
+    )
   end
 
 private

app/services/storage/s3_service.rb

@@ -20,10 +20,15 @@ module Storage
       response.key_count == 1
     end
 
-    def get_presigned_url(file_name, duration)
+    def get_presigned_url(file_name, duration, response_content_disposition: nil)
       Aws::S3::Presigner
         .new({ client: @client })
-        .presigned_url(:get_object, bucket: @configuration.bucket_name, key: file_name, expires_in: duration)
+        .presigned_url(
+          :get_object,
+          bucket: @configuration.bucket_name,
+          key: file_name,
+          expires_in: duration,
+          response_content_disposition: response_content_disposition,)
     end
 
     def get_file_io(file_name)