Elementor simply uses whatever is the media library, so any changes you make there should be all you need to do. Perhaps following the suggestions at https://docs.elementor.com/article/204-my-changes-do-not-appear-online will help as well.
Best thing is to name your images in an SEO friendly way, before even uploading them to the media library and make sure in the uploading proces to add an SEO friendly Alt tag as well.
When you want to change the image name after they have been uploaded, click edit image in media libray and add the SEO friendly alt tag in there.
And as said in previous comment, this actually is not an Elementor thing -:)
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This reply was modified 7 years, 7 months ago by
LogoLogics.
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This reply was modified 7 years, 7 months ago by
LogoLogics.
By the way, this plugin might be a good alternative to change the names too:
https://wordpress.org/plugins/phoenix-media-rename/