Result of copyCommand. Single-file (copy is always one-source-one-destination).
Destination bucket name.
Destination file name (the B2 key in the destination bucket).
B2 file ID of the newly-created destination object.
Byte size of the copied object.
Source bucket name.
Source file name (the B2 key in the source bucket).
Result of copyCommand. Single-file (copy is always one-source-one-destination).