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Hello there, mr-macadamia. Thank you for reaching out to us in the Community space. We are here to assist you with saving a transaction using your QuickBooks Online app on iOS. Let's dig into this concern.

Beforehand, to better understand your concern and provide an accurate solution, we would appreciate more details about the specific transaction you are attempting to save. Any additional information you can provide will help address your issue effectively.

In the meantime, we can begin troubleshooting to eliminate the possibility of any application-related issues. It's important to note that applications can accumulate temporary files that may impact the app's performance. To proceed with troubleshooting, you can follow these steps:
 

1. In Settings, hit General.
2. Click iPhone storage and tap QuickBooks Online app.
3. After that, tick Offload to free up the storage without deleting the app's documents and data.

On the other hand, if you require guidance on downloading transactions in QuickBooks Online in the future, you can refer to this resource: Manually upload transactions into QuickBooks Online.

Please feel free to provide any further information regarding your concern, mr-macadamia. I am committed to assisting you and resolving this matter promptly.