By remote access from android or iphone I cannot customise invoice then can not preview them neither?

Welcome to the Community, @NobiHome. Allow me to provide you with some information regarding remote access on your mobile phone.

QuickBooks Online Mobile app offers quick and easy transactions for your business. For you to remotely access your invoices using your mobile app we have to make sure that your system has met the standards of QBO to be able to function well, however, this feature is not available on Android devices. 

Given that you have your iOS device with you, I suggest resetting your app data, by following the steps below: 

1. Go to Menu ☰ then tap Help & Feedback.
2. Click Refresh Data.
3. Tap Refresh to confirm.

If the issue persists, we can uninstall and then reinstall your application to start afresh. 

Alternatively, you can access your QBO account and start customizing your invoices using a supported web browser. 

Also, updating your OS to the latest version can help you run the application smoothly. 

• For Apple products, your device will need to be running iOS 11.1 or newer.

I’m adding this article if you want to compare other mobile app features: Compare mobile app features.

Let me know if you have additional questions regarding your QBO mobile app features by leaving a comment below. I’ll be happy to help. Have a great day ahead!