An object is a basic data unit of OBS. It contains both data and the metadata that describes data attributes. Data uploaded to OBS is stored into buckets as objects. For details about a bucket, see Bucket.
Generally, objects are managed as files. However, OBS is an object-based storage service and it does not involve the file and folder concepts. For easy data management, OBS provides a method to simulate virtual folders. By adding a slash (/) in an object name, for example, test/123.jpg, you can simulate test as a folder and 123.jpg as the name of a file under the test folder. However, the key remains test/123.jpg.
When uploading an object, set a storage class; otherwise, the object will use the storage class of the bucket to which the object is uploaded. You can also change the storage class of an existing object in a bucket.
In either OBS Console or OBS Browser, you can use folders directly.