Attachment fields are triggered in the field.edit.after stage. At this time, the add action has occurred, but upload has not yet been triggered.

Parameters

Parameter	Description	Type
fieldName	api_name of the field that triggered the event	String
objApiName	api_name of the object that triggered the event	String
dataIndex	dataIndex of the record that triggered the event, used for detail-object data	String
changeData	All field data changed by this edit action	Object
type	add, add action	String
fileInfos	Files that are about to be uploaded	Array

Return Value

Parameter	Description	Type
notTriggerCalUi	Specifies that this calculation/UI event should not be triggered	Boolean
extraCalUiParams	Parameters used to customize the upcoming calculation/UI event logic	Object
fileInfos	Files returned for upload	Array

fileInfo properties

Property	Description	Type
filename	File name	String
ext	File extension	Object
size	File size in bytes	Number
path	Uploaded images may have a path	String
fileId	Only available for cloud-disk files (not guaranteed)	String
filePath	Local file path (not guaranteed)	String

Code Example

Modify files to upload:

{
    event: "field.edit.after",
    functional: function (pluginExecResult, options) {
      	let {fileInfos} = options;
    		fileInfos.splice(0,1);
    }
}