I send invoice using whatsapp but the copy does not includude of my signature ... where could go wrong?

Welcome to the Community page, daud. I can assist you in sending your invoice with your signature via WhatsApp.

Technical glitches may have an impact on your experience while sending your invoices. I understand the significance of including signatures on your transaction. To isolate the issue, try sending a test invoice to yourself. It's the best place to check if the signature is visible on different devices or WhatsApp versions.

If it works fine, then you're good to go. You may ask your customer to update their WhatsApp to receive invoices with signatures.

However, if the issue persists, you can reset your app's data to clear the cache and restore it to its default state. To start:

1. Go to the Home menu or tap the three dots in the upper right corner.
2. Click on Settings.
3. Choose the Refresh Data option, then hit Yes to confirm the action.

After that, send your invoice again. 

You can also uninstall and reinstall the application to narrow down the result.

On the other hand, you may run through the resources from this article for more hints while adding signatures to your invoices: Capture signatures using the QuickBooks Online app.

By the time your customers pay their dues, record the payment right away.

Please let me know in the comment section below if you have follow-up questions while working with your invoices. I'm just a few clicks away to help you again. Have a good one!