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Specify the remote file, resource name, the URL link. As for authentication, Acho currently supports three methods:
None: If API is for the public to use, it's no need to provide authentication.
Basic Authentication: requires to provide username and password.
API Key Authentication requires to provide an API key.
If the dataset that you want to import has a download button, you can just right-click the button and choose "Copy link address". Then, you can directly import the dataset to Acho from API without downloading the file. (The example is from here)