I went to enter expenses on the app, but when it came to select payee, all my suppliers where gone, and just had customers in list.. where are they? 😡

I understand that you're experiencing issues with the QuickBooks Online app. It can be quite frustrating to come across this problem while attempting to enter expenses, info. I'm here to help you with the problem concerning your supplier list in the QuickBooks App.

When QuickBooks has unexpected behavior, let's try resetting the app data to clear the cache and refresh it into its default state. Before doing so, let's ensure that your QuickBooks Online (QBO) mobile app is updated as well as your phone's OS. It helps your application work continuously without interruptions. 

Here's how:

For iOs devices:

1. Go to the Help menu.
2. Select Reset App Data.
3. Click OK.

For Android devices:

1. In your QBO mobile app, select the Gear icon.
2. Choose the Refresh Data menu.
3. Click Yes.

Other than using the mobile app, you also have the option to record a billable expense by logging into your account through a web browser. 

Keep your post coming if you need further assistance managing expenses.  I’m always here to help. Have a great day.