OpenKeychain is great for keys on Android. It's FOSS and available on FDroid. +1 for using a self hosted Nextcloud instance to keep things in sync.
this post was submitted on 27 Jun 2023
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I keep my keys on a Yubikey. I've not really had a need to use the GPG portion of this on Android, but it works fine on Linux and MacOS.
I used this guide: https://github.com/drduh/YubiKey-Guide
Just as an example usage tying all of this together, I keep my passwords in pass and access them (on Android) via Password Store. I also keep my encryption subkey on a Yubikey, which, along with OpenKeychain, lets me decrypt the passwords. It might have been a little finnicky to set up, but it's very streamlined once functional and it's worked like a charm for several years now!
keep them in my NC and just import them to thunderbird
Sounds like a good idea, and was considering it. But curious if there is other or better ways.
If they don't need to be accessed often you could also put them in an encrypted folder or file using veracrypt