I just saw someone ask why it always shows "insufficient balance" when withdrawing U earlier. Actually, many beginners fall into this trap. The key point is that network fees are deducted directly from the amount you want to withdraw, not added on top. For example, if you have 100 U in your wallet and want to withdraw it all, the system will first calculate the fee (maybe 5 U), and then deduct it from your 100 U. So, if you enter a withdrawal amount exactly equal to your balance, you'll see the "insufficient balance" message because the system doesn't have enough funds to complete both the transfer and pay the network fee. The solution is simple: withdraw a little less to leave room for network fees, or first check what the actual network fee is, then subtract it from the total amount. This way, you won't get stuck. Has anyone else encountered this problem?