curl -X PUT https://upload.box.com/api/2.0/files/upload_sessions/F971964745A5CD0C001BBE4E58196BFD \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H "Digest: sha=fpRyg5eVQletdZqEKaFlqwBXJzM=" \
     -H "Content-Range: bytes 8388608-16777215/445856194" \
     -H "Content-Type: application/octet-stream" \
     --data-binary @<FILE_NAME>

//Reading a large file
FileInputStream fis = new FileInputStream("My_Large_File.txt");
//Create the digest input stream to calculate the digest for the whole file.
DigestInputStream dis = new DigestInputStream(fis, digest);

List<BoxFileUploadSessionPart> parts = new ArrayList<BoxFileUploadSessionPart>();

//Get the part size. Each uploaded part should match the part size returned as part of the upload session.
//The last part of the file can be less than part size if the remaining bytes of the last part is less than
//the given part size
long partSize = sessionInfo.getPartSize();
//Start byte of the part
long offset = 0;
//Overall of bytes processed so far
long processed = 0;
while (processed < fileSize) {
    long diff = fileSize - processed;
    //The size last part of the file can be less than the part size.
    if (diff < partSize) {
        partSize = diff;
    }

    //Upload a part. It can be uploaded asynchorously
    BoxFileUploadSessionPart part = session.uploadPart(dis, offset, (int)partSize, fileSize);
    parts.add(part);

    //Increase the offset and proceesed bytes to calculate the Content-Range header.
    processed += partSize;
    offset += partSize;
}

upload_session = client.upload_session('11493C07ED3EABB6E59874D3A1EF3581')
offset = upload_session.part_size * 3
total_size = 26000000
part_bytes = b'abcdefgh'
part = upload_session.upload_part_bytes(part_bytes, offset, total_size)
print('Successfully uploaded part ID {0}'.format(part['part_id']))

// Upload the part starting at byte offset 8388608 to upload session '93D9A837B45F' with part ID 'feedbeef'
client.files.uploadPart('93D9A837B45F', part, 8388608, 2147483648, {part_id: 'feedbeef'}, callback);