If you look carefully at the video (Wallet Overview) OP actually has 2.49 BNB in the spot wallet. When he tried to convert it, he suddenly has 0.0185 BNB only that's available for conversion which is even way below the minimum.
Question is where's the Rest of the BNB that was shown to be in the spot wallet?
The youtube video turns to private again I can't watch the video to check where you see the 2.49 BNB.
Anyway, if that's the case if it's only wallet overview it means all wallets not only on spot wallet but can be also on other wallets like p2p or maybe in BNB vault or invested on flexible saving.
Op must change the video to public again so that I can check if it's a total amount on overview or it's only on spot wallet.