Excessive data build-up in your browser can cause platform issues, such as the problem you're encountering with adding attachments, TDBrodie.
To resolve this, I recommend clearing your browser's cache. This troubleshooting step helps eliminate outdated or overloaded browser components.
Follow the steps to clear the cache for your browser:
If the issue persists, you can use another supported browser.
Once the attachment is added, you can now upload the receipt into QuickBooks. For more details, open this link: Upload your receipts and bills to QuickBooks Online.
Please let me know if you have follow-up questions about uploading receipts or anything else. I'm here to help.