Cancels an operation (move, copy or delete) being performed on a photo or video.
Internally this operates by creating a per-operation temporary sentinel file
which is checked prior to each individual operation. The
cancel operation must match the
id of the original operation
exactly (contents and order), or the cancellation operation will not find
a matching operation to cancel.
|Name of action
|Comma separated list of album IDs
id not passed, assumes root folder.
cancel can return one of the following error values: