Using Your Vault with iCloud Drive
You can keep your Kakuremi vault in iCloud Drive so the same .kdbx file is reachable from another iPhone or iPad. This is file portability handled by Apple's Files app — Kakuremi has no built-in cloud sync, background syncing, or conflict resolution of its own.
How storing in iCloud actually works
Kakuremi reads and writes a single local .kdbx file. It does not run its own cloud sync — there is no background syncing and no conflict resolution inside the app. When you keep the file in iCloud Drive, any "syncing" is Apple's Files and iCloud Drive provider moving the file between devices; Kakuremi only opens the file it is pointed at and saves changes back to it.
Put the database in iCloud Drive
Choose an iCloud Drive location when you create the database: in the Files save dialog, pick an iCloud folder instead of On My iPhone. If your vault already lives on the device, open the Files app and move the .kdbx file into an iCloud Drive folder. Afterwards, return to Kakuremi and load it with Open from Files.
Open from Files opens the Paywall, so opening a second database from iCloud is a Pro feature.Open the same vault on another device
With the file in iCloud Drive, you can open the same vault on another iPhone or iPad: install Kakuremi there, tap Open from Files, and select the .kdbx file from iCloud Drive. Each vault shows its storage location label in the Recent Databases list, so you can confirm which file you are opening.

Edit on one device at a time
Because there is no conflict detection, the last save wins. If two devices edit the same file around the same time, one device's changes can be lost silently with no warning.
If the file will not open
iCloud's Optimize Storage can leave a file as a placeholder that has not been downloaded yet. Opening it then can fail with a fileUnreadable error. To fix it, open the Files app, tap the .kdbx file to download it fully, then retry in Kakuremi.