huggingface_hub: 413 Client Error: Payload Too Large when using upload_folder on a lot of files

Describe the bug

When trying to commit a folder with many CSV files, I got the following error:

HTTPError: 413 Client Error: Payload Too Large for url: https://huggingface.co/api/datasets/nateraw/test-upload-folder-bug/preupload/main

I assume there is a limit to total payload size when uploading a folder that I am going over here. I confirmed it has nothing to do with the number of files, but rather the total size of the files that are being uploaded. It would be great in the short term if we could document what this limit is clearly in the upload_folder fn.

Reproduction

The following fails on the last line. I wrote it so you can run it yourself without updating the repo ID or anything…so if you’re logged in, the below should work (assuming you have torchvision installed).

import os

from torchvision.datasets.utils import download_and_extract_archive
from huggingface_hub import upload_folder, whoami, create_repo

user = whoami()['name']
repo_id = f'{user}/test-upload-folder-bug'
create_repo(repo_id, exist_ok=True, repo_type='dataset')

os.mkdir('./data')
download_and_extract_archive(
    url='https://zenodo.org/api/files/f7f7377b-8405-4d4f-b814-f021df5593b1/hyperbard_data.zip',
    download_root='./data',
    remove_finished=True
)
upload_folder(
    folder_path='./data',
    path_in_repo="",
    repo_id=repo_id,
    repo_type='dataset'
)

Logs

---------------------------------------------------------------------------
HTTPError                                 Traceback (most recent call last)
<ipython-input-2-91516b1ea47f> in <module>()
     18     path_in_repo="",
     19     repo_id=repo_id,
---> 20     repo_type='dataset'
     21 )

3 frames
/usr/local/lib/python3.7/dist-packages/huggingface_hub/hf_api.py in upload_folder(self, repo_id, folder_path, path_in_repo, commit_message, commit_description, token, repo_type, revision, create_pr)
   2115             token=token,
   2116             revision=revision,
-> 2117             create_pr=create_pr,
   2118         )
   2119 

/usr/local/lib/python3.7/dist-packages/huggingface_hub/hf_api.py in create_commit(self, repo_id, operations, commit_message, commit_description, token, repo_type, revision, create_pr, num_threads)
   1813             token=token,
   1814             revision=revision,
-> 1815             endpoint=self.endpoint,
   1816         )
   1817         upload_lfs_files(

/usr/local/lib/python3.7/dist-packages/huggingface_hub/_commit_api.py in fetch_upload_modes(additions, repo_type, repo_id, token, revision, endpoint)
    380         headers=headers,
    381     )
--> 382     resp.raise_for_status()
    383 
    384     preupload_info = validate_preupload_info(resp.json())

/usr/local/lib/python3.7/dist-packages/requests/models.py in raise_for_status(self)
    939 
    940         if http_error_msg:
--> 941             raise HTTPError(http_error_msg, response=self)
    942 
    943     def close(self):

HTTPError: 413 Client Error: Payload Too Large for url: https://huggingface.co/api/datasets/nateraw/test-upload-folder-bug/preupload/main

### System Info

```shell
Colab