python upload file OverflowError

I need to upload all the files in a directory through the API, the largest file is about 20 gb, but I keep getting an OverflowError with files larger than 2GB. I'm using the example of this thread (https://www.dropboxforum.com/t5/API-Support-Feedback/python-upload-big-file-example/m-p/166626). But I can't make it work.

 

This is the code:

def subebackups():
    dbx = dropbox.Dropbox('MY_APP_TOKEN',timeout=36000)
    rootdir = 'ROOT_DIR'
    file_size = os.path.getsize(rootdir)
    CHUNK_SIZE = 50 * 1024 * 1024
    for dir, dirs, files in os.walk(rootdir):
        for file in files:
            file_path = os.path.join(dir, file)
            dest_path =  os.path.join('/Backups/Backups', file).replace("\\","/")
 
            with open(file_path, "rb") as f:
                if file_size <= CHUNK_SIZE:
                    dbx.files_upload(f.read(), dest_path)

                else:
                
                   upload_session_start_result = dbx.files_upload_session_start(f.read(CHUNK_SIZE))
                   cursor = dropbox.files.UploadSessionCursor(session_id=upload_session_start_result.session_id,
                                                              offset=f.tell())
                   commit = dropbox.files.CommitInfo(path=dest_path)

                   while f.tell() < file_size:
                       if ((file_size - f.tell()) <= CHUNK_SIZE):
                           print(dbx.files_upload_session_finish(f.read(CHUNK_SIZE),
                                                           cursor,
                                                           commit))
                       else:
                           dbx.files_upload_session_append(f.read(CHUNK_SIZE),
                                                           cursor.session_id,
                                                           cursor.offset)
                           cursor.offset = f.tell()

This is the ouput with files larger than 2 GB:

 

Traceback (most recent call last):
File "C:\Users\Ordico\Downloads\tools-master\tools-master\dropbox\SubeBackupsDropbox.py", line 66, in <module>
subebackups()
File "C:\Users\Ordico\Downloads\tools-master\tools-master\dropbox\SubeBackupsDropbox.py", line 40, in subebackups
dbx.files_upload(f.read(), dest_path)
File "C:\env\dropbox\lib\site-packages\dropbox\base.py", line 2960, in files_upload
r = self.request(
File "C:\env\dropbox\lib\site-packages\dropbox\dropbox.py", line 311, in request
res = self.request_json_string_with_retry(host,
File "C:\env\dropbox\lib\site-packages\dropbox\dropbox.py", line 461, in request_json_string_with_retry
return self.request_json_string(host,
File "C:\env\dropbox\lib\site-packages\dropbox\dropbox.py", line 557, in request_json_string
r = self._session.post(url,
File "C:\env\dropbox\lib\site-packages\requests\sessions.py", line 578, in post
return self.request('POST', url, data=data, json=json, **kwargs)
File "C:\env\dropbox\lib\site-packages\requests\sessions.py", line 530, in request
resp = self.send(prep, **send_kwargs)
File "C:\env\dropbox\lib\site-packages\requests\sessions.py", line 643, in send
r = adapter.send(request, **kwargs)
File "C:\env\dropbox\lib\site-packages\requests\adapters.py", line 439, in send
resp = conn.urlopen(
File "C:\env\dropbox\lib\site-packages\urllib3\connectionpool.py", line 670, in urlopen
httplib_response = self._make_request(
File "C:\env\dropbox\lib\site-packages\urllib3\connectionpool.py", line 392, in _make_request
conn.request(method, url, **httplib_request_kw)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\http\client.py", line 1230, in request
self._send_request(method, url, body, headers, encode_chunked)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\http\client.py", line 1276, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\http\client.py", line 1225, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\http\client.py", line 1043, in _send_output
self.send(chunk)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\http\client.py", line 965, in send
self.sock.sendall(data)
File "c:\users\ordico\appdata\local\programs\python\python38\lib\ssl.py", line 1204, in sendall
v = self.send(byte_view[count:])
File "c:\users\ordico\appdata\local\programs\python\python38\lib\ssl.py", line 1173, in send
return self._sslobj.write(data)
OverflowError: string longer than 2147483647 bytes