Hello there, @krtharan.
The steps provided by my colleague above is for QuickBooks Online. You'll see a paper clip if there's added a receipt on it. Let me walk you through the process on how to delete a receipt that you uploaded in QuickBooks Self-Employed.
I'm adding a screenshot for visual reference.
Also, I'm adding these helpful articles that you can read about receipts in QBSE:
Let me know if you need further questions about receipts or any concerns about QuickBooks Self-Employed. I'm here to lend a hand. Take good care.