I'm here to provide information about the undone tasks for your estimates in QuickBooks Online (QBO), @jen-greenfernstu.

In QuickBooks Online, the auto-save feature is currently unavailable. If you have an unfinished task, it's important to manually save your progress before leaving the task or the page to avoid losing any unsaved changes.

Moreover, you can check out this article for future reference on how you can record your payments from your customer: Record invoice payments in QuickBooks Online.

You're always welcome to post to the Community if you need additional help recording transactions. Feel free to click the Reply button to start posting here. I'm always available to help.