Thank you for letting us know that some of your captured receipts are not automatically attached to your expenses. We can do some steps to check if this behavior is caused by random browser issues.
Let's start by signing in to your QBO company using a private window. This step will disable the extensions and stops the cache from saving your search history.
If private browsing shows your payment history, you can clear your browser's cache. If not, please use a different browser to see if this only happens to the one you are using. The hyperlinked article is a US version, but you can also use it.
You can also try entering captured receipts as expenses using a mobile phone for comparison. Please check out the video clip in this article for your reference: Upload your receipts and bills to QuickBooks Online.
You can always visit us using this thread if you need anything else. Have a good one!
Thanks for letting us know that you're using the QuickBooks Online mobile app. Let's refresh the app data. Performing this will depend on your device.
A. iOS devices
B. Android devices
If refreshing app data does not work, proceed to uninstall and reinstall the QuickBooks Online mobile app.
Feel free to drop a comment below if you need further assistance. I'll be around to help.