Since the new update, I can’t add attachments to transactions the option is greyed out.

Are you accessing QuickBooks Online via a web browser or the app?

If you're using the app, log into your account through a web browser instead to add your attachments.

If that doesn't work, open your QuickBooks account in a private or incognito window. This ensures that the site loads without depending on saved data or extensions that could cause issues. Alternatively, you can switch to a different browser for smoother performance.

Let me know if you have additional concerns or need further assistance.