Sometimes the app accumulates temporary cache, which can prevent the multi-invoice matching option from working properly. Did any specific error message pop up when this happened?
In the meantime, let's start by logging out and back into the QuickBooks mobile app to refresh your connection. If that doesn't fix the matching issue, I recommend performing some general app troubleshooting steps. You can refer to this article for instructions: Fix common issues in the QuickBooks mobile app.
Beyond that, you can also log into QuickBooks Online through your mobile web browser to complete the match right away.
We'll be right here if you have further questions.
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