[zeroname]

Дополню JS, дал не полностью.

if (field.type !== 'file') {
					if (field.type == 'checkbox') {
						message += `<p><b>${field.dataset.field} :</b> ${(field.checked?'Да':'Нет')}</p>`;
					}else{
						message += `<p><b>${field.dataset.field} :</b> ${field.value}</p>`;
					}
				}
			};
			
			try {
				let data = new FormData();
				const fileInput = Array.from(fileds).find(el => el.type === 'file');
				if (fileInput) {
					const fileInputFiles = fileInput.files;
					for (var i = 0; i < fileInputFiles.length; i++) {
						var file = fileInputFiles[i];
						// Add the file to the request.
						data.append('files[]', file, file.name);
					}
				}
				
				
				data.append('message', message);