Recovering data and encrypted data on a new Joplin install on iOS

Yes, I’ve read this several time and I follow it step by step. I also read the spec to better understand how it works.
But for now, I finlally remove the encryption, which is not the result I’d like, and reinstall one more time the iOS apps (on iPhone and iPad) form scratch. Now I had all my files and folders back, but an orange bar appears on every apps (macOS included) asking for a decryption password on iOS, and for a master key’s password on macOS.
As it took much time to reach this result, I’m a bit reserved to launch another try on encryption (though I’d like to encrypt my file) - I don’t want to end reinstalling everything.
Note that I use Dropbox sync, and that I don’t touch the macOS app to avoid loosing all my files (not sure they could be save with only a copy on Dropbox).
It seems encryption has problem in this other topic.
Finally, if I can’t re-encrypt my files properly, I’d like to remove the orange bar… but I’d like better recovering encryption.