Does Kindle sync furthest read reliably with Android Kindle app?

[itm]

I'm looking for an eReader for my wife, who currently reads mainly DRM-free ePubs on her Pixel phone (using Play Books). She would like to have a dedicated eReader for "planned" reading, but would like one that remembers her place in the book when she switches between devices - both from phone to eReader and eReader to phone. So she can use the phone for ad hoc reading when she doesn't have the eReader with her, and can switch back to the eReader when it's available - without losing her place in the book.
The obvious solution is a Kindle (which I guess would require converting each ePub to Mobi format), but my question is: do Kindle eReaders reliably sync reading posiition (furthest read?) in both directions with the Kindle app on Android phones?
If not, can anyone recommend a better solution for this problem?

[Scoob]

I am fairly certain however sideloaded content does sync when you use the send to kindle service. There are two ways to use that service one is to simply email the epub to the kindle app and kindle. The email address can be found in the settings menu. The other method is to use the website send to kindle. Whichever you choose will automatically convert your epub to a kindle friendly format.

Make sure whispersync and wifi (or data on phone) is turned on both the kindle and on the kindle app and it will sync the bookmarks, notes, highlights, and last page read.

[Sirtel]

Originally Posted by Scoob

New Kindles do have the ability to read DRM free Epubs without needing to convert to MOBI.

No, they don't. If you send your epub via Send to Kindle, Amazon will convert it to a Kindle format. If you sideload that epub via USB, your Kindle will be unable to read it.

That said, MOBI is an old and outdated format. For USB transfer, AZW3 is best, but it won't sync between different devices. For this you'll need to send your epubs via Send to Kindle service.

[Martinoptic]

You cannot sideload epubs to kindle.
You can send to kindle which converts them to a file type kindle app/reader can read.
@Scoob, I agree with the rest of your post (FWIW).

[itm]

Thanks for the feedback. Does the Kindle sync "furthest read" automatically while reading, or does the user need to trigger it manually - either by closing the ebook or selecting sync from a menu?

[Scoob]

Originally Posted by itm

Thanks for the feedback. Does the Kindle sync "furthest read" automatically while reading, or does the user need to trigger it manually - either by closing the ebook or selecting sync from a menu?

It will be automatic if your wife has wifi turned on the entire time your wife is reading on either the kindle or the app. If she doesn't she will need to turn it on for a quick manual sync before she switches devices. Then whichever device she switches to continue reading will need its wifi turned on too so the location can be updated.

[Frogm4n]

https://www.amazon.com/sendtokindle

There are many methods to use Send to Kindle, but most people think about email because it was the first method that was available and that people learned to use. You can use computer and phone apps, browser plugins, email, etc., to upload with. Documents uploaded with Send to Kindle will sync across devices and apps signed into the same Amazon account.