diff --git a/wled00/json.cpp b/wled00/json.cpp
index 2fe5cba8..8b84eabd 100644
--- a/wled00/json.cpp
+++ b/wled00/json.cpp
@@ -1078,6 +1078,9 @@ void serializeInfo(JsonObject root)
   wifi_info[F("channel")] = WiFi.channel();
   wifi_info[F("ap")] = apActive;
 
+#if defined(ARDUINO_ARCH_ESP32) && !defined(WLEDMM_FILEWAIT)
+  updateFSInfo(); // refresh flash usage info - may cause flicker unless we have the RMTHI driver
+#endif
   JsonObject fs_info = root.createNestedObject("fs");
   fs_info["u"] = fsBytesUsed / 1000;
   fs_info["t"] = fsBytesTotal / 1000;
diff --git a/wled00/wled_server.cpp b/wled00/wled_server.cpp
index 7e2cd879..5bd3df1f 100644
--- a/wled00/wled_server.cpp
+++ b/wled00/wled_server.cpp
@@ -126,6 +126,7 @@ void handleUpload(AsyncWebServerRequest *request, const String& filename, size_t
         request->send(200, "text/plain", F("File Uploaded!"));
     }
     cacheInvalidate++;
+    updateFSInfo(); // refresh memory usage info
   }
 }