使用ESP8266FS上传的文件无法打开的原因？如何解决？

您好，
我在读取使用 ESP8266FS 上传的文件时遇到问题。
上传文件，一切正常...（注意：我正在上传一个名为“index.html”的文件）
代码：全选[SPIFFS] data    : C:UsersharolOneDriveDocumentsArduinouploaddata
[SPIFFS] size    : 2024
[SPIFFS] page    : 256
[SPIFFS] block   : 8192
/index.html
[SPIFFS] upload  : C:UsersharolAppDataLocalTemparduino_build_598521/upload.spiffs.bin
[SPIFFS] address  : 0x200000
[SPIFFS] reset    : --before default_reset --after hard_reset
[SPIFFS] port     : COM4
[SPIFFS] speed    : 115200
[SPIFFS] python   : C:UsersharolAppDataLocalArduino15packagesesp8266toolspython33.7.2-post1python3.exe
[SPIFFS] uploader : C:UsersharolAppDataLocalArduino15packagesesp8266hardwareesp82662.7.4toolsupload.py

esptool.py v2.8
Serial port COM4
Connecting....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 5c:cf:7f:24:7b:23
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 2072576 bytes to 2730...
Wrote 2072576 bytes (2730 compressed) at 0x00200000 in 0.2 seconds (effective 67815.2 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...


但是，当我使用以下草图查看文件是否打开时......
代码：全选#include "LittleFS.h"

void setup() {
  Serial.begin(115200);

  Serial.println(":mount_fs");
  Serial.print(F("mounting file system..."));
  if (LittleFS.begin()){
      Serial.print(F("done.n"));
  } else{
      Serial.print(F("failed.n"));
  }

  File file = LittleFS.open("./index.html", "r");
  if(!file){
    Serial.println("Failed to open file for reading");
    return;
  }

  
  Serial.println();
  Serial.println("File Content:");
  while(file.available()){
    Serial.write(file.read());
  }
  file.close();

}

void loop() {
  // put your main code here, to run repeatedly:

}