I've got some insights to share about paying a bill using the Director's Current Account in QuickBooks Online.
At this time, the system doesn't allow you to utilize an asset account for an expense transaction. However, there are a couple of ways that you can perform to achieve this goal.
Here's a link that provides complete details as to why this process isn't available and on what are the actions that needs to be taken to pay your bill: Create payment from directors loan for an expense.
For your reference, I also have here some resources that you can check out you on how pay your bills in QBO and on what are the different accounts that you can use to manage your expenses: