Invoice and proposal letterhead not showing up in app however is online.

I appreciate you posting this here in the Community, @tomsrivertreeser. Allow me to share some insights about this matter.

Clearing the data in your QuickBooks mobile app can help you fix problems with it. It helps to refresh applications and removes typical screen freezing difficulties. I recommend you try the following steps if you haven't already.

For iOS, these are the steps:

1.   Go to Menu ☰ and tap Help & Feedback.
2.   Tap Refresh Data.
 Note: A message appears “Caution. If there was a problem getting your latest QuickBooks Online data, you can refresh it now. It may take a few minutes.”
3.   Tap Refresh to confirm.

For Android, here’s how:

1. Go to Menu ☰ then tap More Options⋮.
2. Tap Settings then Refresh Data.
3. Tap Yes to confirm.
   

For additional troubleshooting options for android, you can consider checking this article about fixing common errors in the QuickBooks Online mobile app for Android.

Please know that you can always get back to me if you have additional QuickBooks related questions. I’m just a few clicks away. Stay hydrated and Keep safe!

No this did not change anything. I am still missing the estimate and invoice header on the app. Still working 3 days ago next morning did not. What happened?

Thanks for getting back to us and providing updates, @tomsrivertreeser.

Since refreshing your data doesn't resolve your concern, I'd suggest uninstalling and reinstalling the application to start with a clean slate. You can check out this article to download the app again: QuickBooks Online Mobile App.

Also, you can continue working with your QuickBooks Online (QBO) account through a web browser. Just access your account via supported browsers. This helps you achieve your QuickBooks tasks.

If you get the same result after uninstalling and reinstalling the app, I'd recommend contacting our Customer Support Team. Our tech support can review your account in a secure environment and take a look at your app to help resolve the issue. 

Here's how:

1. Click the (?) Help icon in the upper right-hand corner of the Dashboard.
2. Select Talk to a Human.
3. Enter a short description of your concern and press Enter.
4. Click I still need a human.
5. Select Contact Us to connect with our live support.
6. Choose Get a callback.

I have also included these helpful articles in case you'll want to get additional information for your reference.

Additionally, to know which QuickBooks Online mobile app features are supported on your mobile device, I encourage visiting this guide: Compare Mobile App Features.

Visit me here again in the Community and keep me posted on your progress in getting this resolved. I'm determined to help you succeed. Stay safe, @tomsrivertreeser.