Photos slideshow changes order of my slides

How do I avoid Photos Slideshow automatically changing the order of the slides I worked so hard to set up in Slideshow? From what I've seen when I googled this question and found my way to this forum, this problem has been an issue since before March 2018. How is it that it's still occurring in August 2022? I tried the first workaround suggestion given in March (to organize the photos in desired order in your Album FIRST, then Create the Slideshow through the sidebar menu as opposed to the File menu at top). All to no avail: After setting up a new album and painstakingly putting all 240 photos in order again, Slideshow changed my order upon pressing PLAY. Fortunately, I kept searching and came across Jazebo's post in Feb. 2020 on the same issue. Their solution also called for organizing the photos in an Album first, but then Control clicking on the album's name in left menu, and choosing Edit ->Select All from top menu before going to File-> Create->Slideshow-Photos. I also did not change the name of the Slideshow; I kept it the same as the Album, as Jazebo mentioned. So far so good! The order of photos I've set in the Album did not changed when I pressed Play! THANK YOU, Jazebo!! I haven't yet tried to export it to anyone else or present on a projector, but am hopeful it will stay as is when I do. I'm a bit leery, though, as when friends have shared their Albums with me, the order of photos has changed from their original order. Not sure how to avoid that issue either.

So why is this still an issue in 2022 that Mac users have to do a Google search in order to resolve something that should be a given, with user-friendly instructions built into Photos/Slideshow, or even better - a Slideshow application that does NOT change your order? Bringing photos into an album (from another album, for example) and then dragging them from the bottom of the new album up into the rest of the slides to the desired position should also not have to be such a time-consuming process. A drag and drop process would be so much easier. Have I missed something?