I use WordPress for most of my projects and I typically submit the "mysite.com/sitemap_index.xml" to Google Search Console but noticed that Posts on a couple of sites weren't being noticed and indexed very quickly, if ever, so I am wondering if submitting the "mysite.com/post-sitemap.xml" might help? I'm not getting any errors, warnings, or penalties, all 100% original and valid content.
I know that Google says they recognize them all when we submit the "sitemap_index.xml" but is there any harm or benefit to submitting the specific "post-sitemap.xml" site map? Will it possibly allow Google to pay attention to it more on a site that has frequent posts that aren't getting indexed in a reasonable amount of time?