From d00e7bc92d5146586376aea8d8bf2d12a4d73c9a Mon Sep 17 00:00:00 2001
From: Niklas Jensen <niklaspj2004@gmail.com>
Date: Thu, 15 Jan 2026 20:11:55 +0100
Subject: [PATCH] Only flush periodically (every 64 chunks)

---
 esp32/src/filesystem_ws.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/esp32/src/filesystem_ws.cpp b/esp32/src/filesystem_ws.cpp
index 0fe6a2d..d749a93 100644
--- a/esp32/src/filesystem_ws.cpp
+++ b/esp32/src/filesystem_ws.cpp
@@ -317,8 +317,11 @@ socket_message_FSUploadChunkResponse FileSystemHandler::handleUploadChunk(const
         return fs_up_response;
     }
 
-    // Flush to ensure data is written
-    state.file.flush();
+    // Flush periodically to prevent LittleFS buffer issues (every 64 chunks = ~64KB with 1KB chunks)
+    if (state.chunksProcessed > 0 && state.chunksProcessed % 64 == 0) {
+        ESP_LOGI(TAG, "Flushing file at chunk %u", state.chunksProcessed);
+        state.file.flush();
+    }
 
     state.chunksProcessed++;
     fs_up_response.success = true;