Hello wordpress lovers,
I accidentally found this way. If you are using User Submitted Post and it won't showing the uploaded images in the post created by users, then you can simply combine it with WP User FronEnd plugin. Both are free plugins. Just install them to your wordpress website.
- Go to Settings > Media and specify the width and height of thumbnail to zero. Tick the box before "Crop thumbnail to exact dimensions (normally thumbnails are proportional)" and then save it.
- Go to WP User Frontend and select "Dashboard" tab. and then tick the box for this "Show Featured Image".
I select Featured image size below it to large (ay be yours won't show the same options, because this seem depend on the template we use.)
Click save button.
And now try to create a post using USP (user submitted post) plugin and see the result.
It work for me. May be it will also work for you!