Progress bar for upload file celery with nginx - python-3.x

Question

I have docker services as web, nginx, celery. I have a dash(plotly) upload component to upload the files. For upload I am displaying a progress bar to show its progress.
app.py # showing main code lines
dbc.Progress(id="pbar"),
dcc.Interval(id="poller", n_intervals=0, max_intervals=0, interval=1000),
dcc.Store(id="store_data"),
dcc.Upload(id="upload", children=html.Div(["Drag and Drop or ",html.A("Select File", title="Click to select file.",),]),multiple=False,)
#callback(Output()..,
Input(component_id="upload_dataset", component_property="filename"),
Input(component_id="upload_dataset", component_property="contents"),*
)
def launch_poll_cancel_upload_task(filename: str, contents: str, *):
triggered_id: Any = ctx.triggered_id
if filename and contents: # upload gets initiated
res1: AsyncResult = task_upload_csv.apply_async(args=(filename, contents), queue="upload")
res2: dict[str, Any] = {
"poller_max_intervals": -1,
"poller_n_intervals": no_update,
"upload_filename": no_update,
"upload_contents": no_update,
"upload_disabled": True,
}
return tuple([v for k, v in res2.items()])
if triggered_id == "poller": # display progress of progress bar during polling operation
res3 = result_from_tuple(data, app=celery_app) # task object
progress = min(n_intervals % 110, 100)
res4: dict[str, Any] = {
"pbar_value": progress,
"pbar_label": f"{progress} %" if progress >= 1 else "",
}
return tuple([v for k, v in res4.items()])
task.py
#celery_app.task
def task_upload_csv(filename: str, content: str):
status = False
file: Path = DIR_NAME / filename
content_type, content_string = content.split(",")
decoded = base64.b64decode(content_string)
if file.is_file():
file.unlink()
with open(file, "wb") as fp:
fp.write(decoded)
msg = f"Dataset {filename} is copied"
status = True
return status
Case-1: uploading small file-size upto 2-3MB, works fine, display progress(1,2,...,100) and get copied/uploaded successfully.
Case-2: uploading large file-size upto 10-100MB, did not work, progress bar is displayed but no animation 1,2... ie empty progress bar and I get warnings as below
[warn] 22#22: *50 a client request body is buffered to a temporary file /tmp/client_temp/0000000019,
and then I see multiple requests are getting fired and returns task(output) as SUCCESS but there is no update/animation in progress bar.But in the end the file is copied successfully.
My understanding is above task_upload_csv() is working only for small file-size (as all the data content is stored in single contents argument of the task_upload_csv()). For large file-size, I think as per warning some data is still available to upload ie. contents argument of the task_upload_csv() is not all content, its in chuncks and thereby progress bar is getting screwed up.
What I am missing or Is there any other way available?