The simpler media website CMS
A small bug with your sitemap tool.
Suppose images per page setting is 30 in options (theme admin page)
Suppose you have 16 jpg and 16 txt files (example : freb.txt, freb.jpg)
Of course, you have activated the extension to be able to use those files.
Now, you use the sitemap tool to erase, recreate the xml files.
You will get an
But you only have ONE page (16 pictures)
This is because all txt files are also counted; this makes a total of 32 > 30 (admin setting)
Google search console complains that you have 404 errors !
Sitemap tool should not count txt files to get the right pages number (and corresponding links.)