I’ll let Mattches do most of the support here but I thought I’d drop in and leave some good reading material you can maybe read in the mean time, if you’re up for it…
Check out the Topic(s) below, click on the header links to read further. Another very helpful Community Ninja put some support together on Brave Sync here (though not just for Brave Sync) and they were helpful for me.
Also, a note from my own experience:
Sometimes upgrades, including the iOS upgrade (and I am mostly referring to iPhone & larger OS upgrades) like the one I(/we?) just had from 18.7 .1 or .2 to 26.0 .1 not too long ago, messed up my Brave Sync on my phone so I had to reset it up, then things were back to normal (the trusted troubleshoot, off and on again sorta thing haha)
Anyway hope these help you too and if it’s too much or confusing leave it and again, just wait for Mattches to guide you through it
(& Not all of the Topics are exactly for your issue but it’s still good stuff to know)