try to speak mangoose

backend/routes/routesToucan.js

@@ -164,7 +164,8 @@ router.route("/img/:id")
                   console.log(err);
                   
                 } else {
-                  res.json(data);
+                  id = data._id;
+                  res.sendFile(path.resolve(env.savedExtensions[1].path,id+".pdf"));
               }});
             } catch (err) {
               console.log(err);