readIntoSync/readAsBytes/readAsBytesSync all do not read the full file size

[gumibears]

Given a file "1.bin". Windows/Android/Python program/C program all read it as having 381536 bytes. When I transfer 1.bin, it programs my esp8266 correctly.
The below methods in DART all print out 381136 bytes. This causes my esp8266 to behave incorrectly. I am not sure why it does not read the remaining 400 bytes consistently no matter what i do.

Example code:
var file = File(_filePath!);
var buffer = List.filled(400000, 0xFF);
print('BUFFER: $buffer');
var raf = file.openSync();
var counter = 0;
for (int i = 0; i < 400000; i += 4096) {
print('Reading from $i to ${i + 4096}');
counter += raf.readIntoSync(buffer, i, i+4096); // Read bytes into the buffer
print('BUFFER: $counter');
}

or

Uint8List fileBytes = file.readAsBytesSync();
print(fileBytes.length);
or
Uint8List fileBytes = await file.readAsBytes();
print(fileBytes.length);

[julemand101]

When I transfer 1.bin

How do you transfer the file?

[gumibears]

ok i figured it out. I was using a much older version of filepicker (5.2.6) from an example code in pubspec.yaml. I updated it to 8.0.3 and it works as intended. sorry for the trouble.