Thanks for the reply, Scott. Here's what I'm finding out. First, Yoast SEO creates a
sitemap_index.xml file. Information on the logic and reasoning can be found here:
https://yoast.com/xml-sitemap-in-the-wordpress-seo-plugin/
I do see that sitemaps are generated, and I've submitted sitemap_index.xml in Google Webmaster and it recognizes it. Here are the sub-index files picked up via sitemap_index.xml:
XML Sitemap
Generated by Yoast's WordPress SEO plugin, this is an XML Sitemap, meant for consumption by search engines.
You can find more information about XML sitemaps on sitemaps.org.
This XML Sitemap Index file contains 6 sitemaps.
Sitemap Last Modified
http://seniorpictures.sashphotography.c … itemap.xml 2014-05-01 23:16
http://seniorpictures.sashphotography.c … itemap.xml 2014-06-03 00:54
http://seniorpictures.sashphotography.c … itemap.xml 2014-04-06 01:18
http://seniorpictures.sashphotography.c … itemap.xml 2014-04-06 01:18
http://seniorpictures.sashphotography.c … itemap.xml 2014-04-06 01:18
http://seniorpictures.sashphotography.c … itemap.xml 2014-02-19 17:35
Also, if you visit the site xml file at:
http://seniorpictures.sashphotography.com/sitemap.xml you will see that it does return the sub-index files. (I guess sitemap.xml is returning sitemap_index.xml?)
So from what I can tell, this should be recognized by Insight. Any ideas?