Triggered when an error occurs while files are being uploaded or removed.
The event object receives the following additional properties:
files- a list of File objects in the current selection operation. Each file contains:
name- the name of the file
size- the size of the file in bytes
type- the file's MIME type
operation- the operation that failed - "upload" or "remove"
listItem- the <LI> element displaying the item
responseText- the error string
status- the status of the operation. Available for "upload" operations in non-iframe mode only.
jqXHR- the jQuery XMLHTTPRequest object, available for "remove" operations only