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I've tried submitting a receipt using the QuickBooks Mobile App and was able to see all of the expense accounts. A possible cache or an outdated app might be the reason why this is happening in your mobile application. I'd like to recommend some steps to help you fix the issue. 

Let's start by making sure that your QuickBooks Online app for iOS or Android is updated to the latest version. Then, close and re-open the app and go to the Menu located at the bottom and select Invoices. Check to see if the transactions are showing by due dates and try to open a paid invoice and look for the pencil icon to edit. 

Otherwise, we can try clearing the app's data to refresh the application settings

In the QuickBooks Online app:

• Android - Tap the menu at the top right and choose Settings. Then select Refresh Data and choose Yes.
• iOS - Tap the menu at the top right and then choose Help & Feedback. Then select Refresh Data and Refresh.

In your Phone Settings:

• Android - From your phone's settings, tap Apps (varies by device). Choose the QuickBooks app from the list and select Storage. Select clear data.
• iOS - From your phone's settings, tap Settings, then, click on General and choose iPhone Storage. Select an app that's taking up a lot of space. To free up the storage without deleting the documents and data for the app, select Offload App.

Once done, restart the application and sign in to your account. Then, try to submit a receipt and check to see if the expense accounts are available.

You can also use the regular browser on your phone to sign in to your QuickBooks Online account and upload the receipt.

Here's how:

1. Go to Transactions > Receipts.
2. In the For Review tab, you can review your uploaded receipts and bills. QuickBooks lets you know if it finds existing transactions in your books that match with your uploaded receipts or bills.
3. Check the labels in the Action column to find out what steps you need to take next.

I'm adding this article for reference: Upload your receipts and bills to QuickBooks Online.

In case you encounter some errors, you can check out the solutions in this article: Fix common errors in the QuickBooks Online mobile app for Android.

Please let me know how things go after trying out the steps. I'll be around to assist you. Take care and stay safe.