Ultimate Member - adding custom fields in account page, edit and save working ok!

add_custom_field_to_ultimate_member_account.txt

add_action('um_after_account_general', 'showExtraFields', 100);

function showExtraFields()
{
	$custom_fields = [
		"razon_social" => "Razón Social",
		"nit" => "NIT",
		"ci" => "CI",
		"phone_number" => "Número de teléfono fijo",
		"mobile_number" => "Número de teléfono móvil",
	];

	foreach ($custom_fields as $key => $value) {
		$fields[ $key ] = array(
				'title' => $value,
				'metakey' => $key,
				'type' => 'select',
				'label' => $value,
		);
    
		$field_value = get_user_meta(um_user('ID'), $key, true) ? : '';
    
		$html = '<div class="um-field um-field-'.$key.'" data-key="'.$key.'">
		<div class="um-field-label">
		<label for="'.$key.'">'.$value.'</label>
		<div class="um-clear"></div>
		</div>
		<div class="um-field-area">
		<input class="um-form-field valid "
		type="text" name="'.$key.'"
		id="'.$key.'" value="'.$field_value.'"
		placeholder=""
		data-validate="" data-key="'.$key.'">
		</div>
		</div>';
    
		echo $html;

	}
  
	apply_filters('um_account_secure_fields', $fields, get_current_user_id());
}