Err, no, the process for switching from one to the other is that they sync last page read automatically. You shouldn't be doing anything.
It works auto-magically for me all the time. I read a lot of books, and I often switch between my Kindle and my phone several times a book.
Maybe you don't have your Kindle connect to your network or whatever, but the reason you're struggling is because you're following the less trodden path.
It works for books I've uploaded to Kindle too, though I always use the upload service via email, precisely because then it's available on both devices.
I'm glad they're getting rid of the location numbering, it's super confusing. I haven't looked into it but it sounds like they're making a genuine improvement to page numbering, but with growing pains.
You're going through a bit of pain while they transition because you use it in a weird way.
> I'm glad they're getting rid of the location numbering, it's super confusing.
In that...?
Locations start at 1 and increase from there. Page numbers are a disaster. In the book I discuss above, page numbers start at 1 alongside "page 1" of the book. There is plenty of material earlier than that, which doesn't have page numbers. It only has location numbers.
The pages of a physical book are larger than a phone screen. So several pages worth of the ebook all have the same page number, which prevents you from jumping to later pages by using the page numbering.
Jumping restrictions are even added in where they aren't needed -- in some books, jumping to location numbers doesn't work. Instead, you jump to a location that is determined by the app as being "near" the location you specified. This has the effect of preventing you from getting all of a particular passage on the screen at the same time, which I want for screenshots.
So no, there's no improvement to numbering going on, just a steady removal of functionality that used to work.
I've had a kindle for years, though it was idle for about the last two... Recently brought it back to life, read a few pages then tried to continue reading on my phone (which I had never used before). First thing it did was take me to the wrong page. I suspect things aren't as perfect as you think they are, and the parent comment has faced issues just as I have. Denial of possible issues is the same as release notes which say "we fixed all the bugs".
It works auto-magically for me all the time. I read a lot of books, and I often switch between my Kindle and my phone several times a book.
Maybe you don't have your Kindle connect to your network or whatever, but the reason you're struggling is because you're following the less trodden path.
It works for books I've uploaded to Kindle too, though I always use the upload service via email, precisely because then it's available on both devices.