I’m experiencing the same issue reported elsewhere with brave browser version 1.8.93 (Android). My basic attention tokens have disappeared/are missing.
I haven’t uninstalled the browser, I’ve only allowed updates from the google playstore (which has never caused me to lose my entire balance before). I really hope I haven’t lost my BAT as there was about 160 or so of them! You can see my history (screenshot) where I’ve been paid regularly before.
I hope this can be fixed and that uphold can be integrated already!
Brave Version: 1.8.93
Mobile Device details: Samsung Galaxy S8 - SM-G950F Build/PPR1.180610.011
Android version: 9