Display posts from other category

hi
in my website, with the plugin News Manager, i added a “news section” (different from the wordpress standard posts section).
I added also a new category for this posts (news)…the “news category”.

If with “Recent Posts Widget With Thumbnail” i select the “news category” it don’t show the news!!! But if i select the standard posts category the widget works!!
Can’t i use posts from the “new section” i create with the news manager plugin???

thanks for help

https://ww.wp.xz.cn/plugins/recent-posts-widget-with-thumbnails/