Problem with adding images

Is it no longer possible to upload numerous photos all at one time and save the slide show, then reorder??? If I upload say a half dozen, I then have to go to the media library and pick them one at at time to create the slide show. I don’t like this. very unfriendly and time consuming.

Or, am I doing something wrong?

Thank you

https://www.ads-software.com/extend/plugins/portfolio-slideshow/