modify env.dev.js

config/env.dev.js

@@ -1,7 +1,7 @@
 module.exports = {
   NODE_ENV: 'development',
   FILE_UPLOAD: 'mongodb',
-  MONGODB_GRIDFS_LIMIT: Infinity,
+  // MONGODB_GRIDFS_LIMIT: 10485760,   // 10MB
   // MATHJAX: 1,
   ELASTICSEARCH_URI: 'http://localhost:9200/growi',
   HACKMD_URI: 'http://localhost:3010',