What to do with sitemap_images.xml and sitemap_video.xml?

Question

Search Engine Optimization

Good morning,
Using the xml-sitemaps.com service, I got the sitemap.xml, sitemap_images.xml and sitemap_video.xml.
sitemap_video.xml is something like this

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1" xsi:schemaLocation=" http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<!--
 created with PRO Sitemap Service https://pro-sitemaps.com 
-->
<url>
<loc>
http://сайт/92513/
</loc>
<lastmod>2017-05-05T20:53:09+00:00</lastmod>
<changefreq>daily</changefreq>
<priority>0.8000</priority>
<video:video>
<video:thumbnail_loc>https://i.ytimg.com/vi/usUw57QLL4I/mqdefault.jpg</video:thumbnail_loc>
<video:title>Art House Xanna</video:title>
<video:description>ragdoll female n 04</video:description>
<video:publication_date>2017-01-06T18:24:11.000Z</video:publication_date>
<video:player_loc allow_embed="yes" autoplay="ap=1">http://www.youtube.com/v/usUw57QLL4I</video:player_loc>
<video:duration>79</video:duration>
</video:video>
</url>

I added sitemap.xml to the root. What to do with the remaining sitemap_images.xml and sitemap_video.xml?
Or maybe combine these 3 files into one and create a new sitemap.xml file i.e.

<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>
http://сайт/sitemap.xml
</loc>
</sitemap>
<sitemap>
<loc>
http://сайт/sitemap_images.xml
</loc>
</sitemap>
<sitemap>
<loc>http://сайт/sitemap_video.xml</loc>
</sitemap></sitemapindex>

What do you think? Thank you

Answer 1

For Google: in the webmaster's section Scanning - Files Sitemap, check and add the files. For Yandex: in the Tools - Sitemap Analysis section, check the files and add them in the Indexing - Sitemap Files section.