Thanks for reaching out to us. I'm here to assist you in fixing the error you encountered in uploading a receipt.
First, I'd like to know the exact error message. That way, I can check if we have an investigation about it and so I can provide a perfect resolution.
In the meantime, you'll want to use an incognito window and upload the receipt from there. Incognito won't save your browsing history which can result in an error.