Hi,
I don't see the API supports direct uploading of text file to cloud.
You may be using their web form to upload file or text data.
To upload through API, there will need to convert data into json format.
I have other solution too, if you are interested. Through VBA, I will automate the browser, which will login to their form and upload file automatically, without any user interaction.
I will further look into their api, if they have any other way.
I am available for both methods, see what suits you most.
Thanks