Connections to cloud stores are stored on the file system as files with the extension .acs. You can create a cloud storage connection using either the New Cloud Storage Connection dialog box or the Create Cloud Storage Connection File geoprocessing tool.
See Create Cloud Storage Connection File for more information about how to create an .acs file. See Connect to a cloud store for more information about how to connect to cloud stores. You do not need cloud storage connection file authentication if you are accessing data from public buckets that do not require authentication.
Note:
You cannot use data from private or protected buckets if the required authentication credentials are not specified in the .acs file. In this case, you can only browse the data on the Parameters and Results tabs in the Search STAC Items pane.