Sync upload fails

[AsadDUET]

Using esp32 board
In the example>storage>sync>upload.ino
I just only changed the file to "/data.csv". and "media/mp4" to "text/csv"
The upload fails
Error, msg: error reading file, code: -104

while this code I inserted in setup prints the contents successfully

File file = MY_FS.open("/data.csv", FILE_READ);
  if (!file) {
    Serial.println("Failed to open file for appending");
    return;
  }
   while (file.available()) {
      String line = file.readStringUntil('\n');
      Serial.println(line);
    }
  file.close();

[mobizt]

In ESP32 SDK v3.x.x, there is the stack limitation issue in the FS class.

You have to define the File globally in ESP32 SDK v3.x.x and this File object will be used in the library locally as in the examples.

Then, you should not put any code or trying to read file in the file callback because of stack limit.

The example code alone works fine otherwise you have the stack limit.