I recently (two months ago) linked my Brave mobile browser with 100BAT to my Uphold wallet with 40BAT in the account. When I linked my wallet to the phone, it updated and showed my wallet balance as 140BAT. I never received a notification from Uphold that funds had been deposited, and when I checked my Uphold account, or view from my desktop browser, it still shows only 40BAT in the account, the 100 from the mobile are missing. If I unlink the phone it returns to having just 100BAT.
I have repeated this process several times with the funds never actually going to my Uphold account. Uphold have said this is a Brave issue as it is not transferring the funds.