A UUID is only returned after For a file upload, a Swarm node returns a UUID only after it successfully receives the final byte is successfully received by the Swarm node. The ; without it, no object is saved. Regardless of success, the node had preallocated the intended size of the abandoned stream is pre-allocated by the node and upload and set aside the disk space set aside to store the streamobject.
Through normal health processing, Swarm will discover this stream upload has been abandoned and reclaim the space that was allocated for the streamobject. This trapped space will not necessarily show up in the available space right away. be counted in your available space immediately, but it will after the cleanup is complete.
See also: How is space reclaimed by a Swarm nodedo I fix trapped space?