Steam Workshop trouble (UGC - steam_ugc_set_item_content)

[TERNOX]

Hi! I have a problem with function steam_ugc_set_item_content.
I made in my game level editor, and I want to bind it to the workshop.

I did everything by example on docs.yoyogames.com:

var app_id = steam_get_app_id(); 
var updateHandle = steam_ugc_start_item_update(app_id, global.Publish_ID); 
steam_ugc_set_item_title(updateHandle, "My workshop item(3)!"); 
steam_ugc_set_item_description( updateHandle, "testing workshop..."); 
steam_ugc_set_item_visibility(updateHandle, ugc_visibility_public); 
var tagArray; 
tagArray[0] = "Test"; 
tagArray[1] = "New"; 
steam_ugc_set_item_tags(updateHandle, tagArray); 
steam_ugc_set_item_preview(updateHandle, "promo.jpg"); 
steam_ugc_set_item_content(updateHandle, "WorkshopContent1"); 
requestId = steam_ugc_submit_item_update(updateHandle, "Version 1.2");

Item created, the picture is loaded, the description is filled in, but the file is not loaded.
I tried to include a link to the folder with the file, and a link to the file - but it is useless.

Please explain to me how it works.