I got curious about this too and dug into how MangaLife handles progress, so here’s the straight talk: by default, MangaLife stores your reading progress locally on the device rather than in a cloud tied to an account. That means if you read on your phone and then pick up a tablet, that on-device bookmark and your read/unread flags usually won’t magically appear on the other gadget. It’s basic, but it keeps things fast and offline-friendly for people who like to stash files locally.
That said, there are practical ways to make your progress follow you around. If you’re comfortable with a little tinkering, you can back up the app’s database or library folder to a cloud service (Google
drive, Dropbox) or use a real-time folder sync tool like Syncthing. The rough flow is: identify the MangaLife folder or database file on your device, sync that folder to the cloud or another device, and then restore or let the synced file overwrite the copy on the second device. Be careful about conflicts — if you read on both devices before they sync, you can end up with duplicated chapters or a lost last-page position.
If you want frictionless cross-device sync, I’ve ended up switching to services and readers that support account-based progress tracking—things like 'MangaDex' on the web, or paid platforms that sync purchases and last-read positions. For casual readers who mostly want portability without fuss, exporting backups occasionally to the cloud works fine; for obsessive collectors, a sync tool or a different app that has built-in cloud sync is less headache. Personally I like keeping my library portable, but I also appreciate the peace of mind of a synced account when I’m switching devices a lot.