Hmm, I tried this, I put 001BTC in my Trust wallet, opened the app on my desktop as you described, selected wallet connect and scanned the QR code, it connected OK, and I entered 0.01BTC to borrow bnb (bsc), I could see my wallet balances, but the "connect wallet" stayed at the bottom of the window, I saw no option to create a loan.

Trust wallet was showing that it was connected to Thorchain too

Hmm, now that I look at my balances in the wallet, I don't see the BTC, but see my other tokens (all BSC tokens), do I need to do something to the BTC to make it loanable ? I see it in my Trust Wallet, but not in my wallet balances on Thorchain desktop app

Any ideas what went wrong ?