I am using Brave on Graphene OS (Android). For a few months now I have had issues with Bitwarden, the pop up to offer autofil options on login forms doesn’t appear. I have all the correct settings to allow it, and it works fine in Firefox and any other browser. It appears to be an issue with Brave. I have just updated Brave and its still the same on the very latest version.
Any website with a login form, should pop up login/password suggestions from Bitwarden. But nothing appears. Copy URL and open in Firefox and hey presto, pops up instantly.