I want to make sure I got your concern correctly so I can share with you the right amount of information. If I may ask, are you trying to locate the snap feature from your QuickBooks application, or are you trying to edit the file uploaded to QuickBooks?
Usually, once you use an iOS or an Android app, you can snap your receipts or bills following these steps:
Open the QuickBooks Online mobile app.
Click on the Menu ≡ icon.
Hit Receipt snap.
Tap on the Receipt camera and snap a photo of your receipt or bill.
Select Use this photo, then Done.
If there are issues with the pictures added, delete them from QuickBooks. Or, log in to QBO using a web browser, then remove the file from the Attachments section.