I know I’ve seen that checkbox before, but I haven’t used that plugin.
But I just tried exports on WP 4.7.19 and WP 5.2.8 and neither one had the checkbox.
If you have a problem with the plugin, you should ask at the plugin’s support forum.
There were changes in WP 5.7 for import/export, but not this checkbox. https://make.wordpress.org/core/2021/02/23/enhancements-to-the-import-export-feature-in-wordpress-5-7/
@joyously I just want to export posts from a website to another but importing all images… WordPress is not importing any image.. I’ve tried sooo manyyy plugins and paid ones but none of them could really get the job done. Any suggestion about exporting posts with images?
You can write a ticket for core exports: https://core.trac.wordpress.org/
You can open a support request for each plugin that isn’t working, in their support forum.
Whenever I have done export/import, I use a plugin and CSV format, because I can easily edit the file in a spreadsheet program. But you can use phpMyAdmin on your database and export to CSV directly, if you want.