Referring the following guide, I created a Notebook in Watson Studio which upload data to the project's IBM Cloud Object Storage Bucket. The file was added to the project's bucket, but it was not added to the project's Data Asset tab.

Working With IBM Cloud Object Storage In Python https://medium.com/ibm-data-science-experience/working-with-ibm-cloud-object-storage-in-python-fe0ba8667d5f

How can I add a data to Data Asset tab in the project by Notebook?

Notebook

 credentials = {
     'IBM_API_KEY_ID': 'xxx',
     'IAM_SERVICE_ID': 'xxx',
     'ENDPOINT': 'xxx',
     'IBM_AUTH_ENDPOINT': 'xxx',
     'BUCKET': 'xxx',
     'FILE': 'xxx.csv'
 }
 
 from ibm_botocore.client import Config
 import ibm_boto3
 
 cos = ibm_boto3.client(service_name='s3',
     ibm_api_key_id=credentials['IBM_API_KEY_ID'],
     ibm_service_instance_id=credentials['IAM_SERVICE_ID'],
     ibm_auth_endpoint=credentials['IBM_AUTH_ENDPOINT'],
     config=Config(signature_version='oauth'),
     endpoint_url=credentials['ENDPOINT'])
 
 df_data_1.to_csv("shimac_test_before_upload.csv", encoding="utf-8")
 with open('shimac_test_before_upload.csv', 'rb') as data:
     cos.upload_fileobj(data,  credentials['BUCKET'], 'shimac_test_afer_upload.csv')