How to display data from a custom field of the "File" type in 1C:Bitrix?

Question

1C-Bitrix

Good day to all!
There are many product sections. On each of them I want to display my image for the section. I'm trying to do it through a custom field of the "File" type (UF_BANNER), but it is not displayed on the page.

Tried output by adding <?=CFile::GetPath($UF_BANNER);?>, <?=CFile::GetPath("UF_BANNER");?> or <?=CFile::GetPath(20);?> (20 - parameter ID) into the page template, but to no avail.
Question: how to display different images through a custom field on different section pages?
I would appreciate any help for a newbie.

Answer 1

<?
$fileimg = CFile::ResizeImageGet($arSection['UF_BANNER'], 
array('width'=>1000, 'height'=>200), 
BX_RESIZE_IMAGE_PROPORTIONAL_ALT, true);
?>
<img src="<?=$fileimg[src]?>">

Maybe not $arSection, but $arItem