After you click the button ‘upload/edit images’, insert media dialog box will be shown. while using tab ‘Upload Files’, there is no problem; while using tab ‘Media Library’, if the option (below the tab name) not set to ‘Uploaded to this post’, there will occur the issue you mentioned. please set the option to ‘Uploaded to this post’ and try again.
Thx you very much, but pictures are already in my wordpress library and I would like use them from it and not upload them again (I’m traveling and the internet speed is difficult to find). Is that possible?