I use Keepass. Like you said, I sync the encrypted storage file through an existing file sync service and use a keepass client on my phone. It's slightly clunkier than I imagine a well-built system designed for multiple devices would be, but it works fine.
I use KeePass. I share its encrypted database among several devices using Dropbox. I could switch to any file-based synchronization solution if I need to.
Short addition: Keepass just stores everything in one encrypted .kdbx file. You can then sync that file to your other devices (phone, other computer etc) using your cloud, nextcloud or if you don't trust any of that using a local filesync solution like Syncthing.
I have explored syncing of these Keepass files with Nextcloud and Syncthing and both just works fine and I can recommend it.
Syncing with Dropbox worked well for me. When you deal with an adversarial server holding your ciphertexts, you have to be a bit careful with the encryption. But keepass is good, AFAIK.
Syncthing improves the security, for instance, just in case a vulnerability creeps into the keepass code.
I actually used to use KeePassXC and have my (encrypted) password file sync'd through Dropbox, but their Android client changed to no support a way to have the file stored offline but also automatically sync changes, so I ended up swapping to Bitwarden. In the past I had used Nextcloud instead of Dropbox, so that would probably be one of my first ideas if I did end up deciding to stop using bitwarden.
I use a key file and a long passphrase to encrypt the database and store the encrypted password db on dropbox which handles the syncing across all my machines and phone.
I use Keepass(XC) across all my devices, windows, Linux and android.
I sync the DB with Nextcloud and encrypt with a combination of password and keyfile. The keyfile is a few KB of /dev/random and I only transfer it "offline" between devices (mostly over USB to/from my phone).
Basically any file sync client. Just keep the keepass database in the folder that gets autosync'd and sync the folder to each device you need keepass on
I use KeePass. It's an offline password manager, so you don't have to worry about trusting a cloud provider to have good security practices. You can sync it using OwnCloud or rsync or whatever you do trust. I use SpiderOak.
I secure mine using a unique password and an SSH key. If you do use a cloud sync service, never sync the SSH key. Keep a copy of it on a USB drive hidden somewhere in your home, and then just copy it onto any device that might need it.
(You definitely can use this system on a mobile phone, but I find it too risky. There are probably ways to make it more secure to have these files on your phone.)
I use KeePass and synchronize the database file through Dropbox. I can recommend this combination, it works well both on my computers and (Android) phone.
The downside is that I sometimes have to enter the master password on my phone's on-screen keyboard, so it is probably shorter than it should be.
Alternatively, you can consider switching to a keepass compatible app. To be completely independent you could save your key file encrypted on a cloud folder (e.g. icloud, onedrive,...) and use any of the available keepass compatible clients on your devices while still having everything in sync.
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