diff --git a/src/api_data/conversation_message_api.rs b/src/api_data/conversation_message_api.rs
index 14eed26..b914b92 100644
--- a/src/api_data/conversation_message_api.rs
+++ b/src/api_data/conversation_message_api.rs
@@ -39,7 +39,7 @@ impl ConversationMessageAPI {
                 url: user_data_url(&file.path.clone()),
                 size: file.size,
                 name: file.name.clone(),
-                thumbnail: file.thumbnail.clone(),
+                thumbnail: file.thumbnail.as_ref().map(|u|user_data_url(u)),
                 r#type: file.r#type.clone(),
             })
         };