Depending on the particular backend, a MediaStore implementation is possibly not able to upload blobs without a content type. Therefore, CoreMedia introduced a new variant of the interface method MediaStore#upload with an additional content type argument and deprecated the old variant. Moreover, the new method returns an UploadResult, which consists of the size of the blob and an optional UUID. It is a default method which delegates to the old one, so you do not need to change your MediaStore implementations immediately.

There is also a new variant of the MediaStore#download method, which receives the UUID that has been assigned to the blob by the upload method. It is a backward compatible default method.