I want to change the field name from “upload” to “file”.
@jyk2021
try this
will not work in IE
webix.attachEvent('onBeforeAjax', function(mode, url, data, request, headers, files){
if(files instanceof FormData && files.has('upload')){//or other conditions
files.set('file', files.get('upload'));
files.delete('upload');
}
})