This just started in the past week. When I edit a PDF, usually by dragging pages from another PDF, sometimes is will lose the original filename, create a new one that seems to be a random string of characters followed by .tmp. If I do "Save As', it tries to save it under that .tmp filename. I have to go back to where I originally opened the document and save over the one I started with. It doesn't happen every time, but I would guess about 70% of the time. I had to do this no less than 15 times today and I'm frustrated.
Ran "repair Installation", but that didn't help.
I expect to be able to open the PDF, add pages to it from "Organize Pages", then save it as the same name it had when I opened it.
Acrobat Pro continuous version 2023.001.20064
Windows 10 Pro 22H2; OS Build 19045.2846; Windows Feature Experience Pack 120.2212.4190.0