Dmitry, there is another question on the structure:
You need to create a file with the following structure
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:g="
http://base.google.com/ns/1.0"><channel>
<title>Checking the connection</title><link>
https://nspace.ua</link><description>Checking the connection</description>
<item>
<g:product_type>Corner sofas</g:product_type>
<g:brand>"TEST", Ukraine</g:brand>
<title>Test Corner Sofa</title>
<g:price>10000.00 UAH</g:price>
<g:id>29594</g:id>
<description><![CDATA[<p dir="ltr"><span>This kit includes:</span></p>
<ul>
<li>
"TEST", Ukraine - 1 piece</li>
………………..</description>
<g:image_link>
https://crm.nspace.ua/media/shop/1e/57/...........jpg</g:image_link></item>
</channel>
</rss>
But the action managed to set up only the line
<title>Checking the connection</title><link>
https://nspace.ua</link><description>Checking the connection</description>
was between the <rss> and <channel> tags
And you need between <channel> and <item>