When will I be able to send a cis invoice on the app?

Great to have you in the Community space, @joshpeep-icloud-.
 

Sending a CIS invoice through QuickBooks Online (QBO) Mobile Apps is currently not available.

In the meantime, you'll want to log in to your account using a regular web browser and send a CIS invoice from there.

I'll show you how:
 

1. Go to + New menu
2. Click Invoice.
3. Select a subcontractor from the customer drop-down.
4. Review the details and click Save and send.

You can also check this article for more details: Already using CIS in QuickBooks?

I can see having this option is beneficial in running your business. I'd recommend sending your feedback to our Development team. This way, they can read your suggestion and might implement it in future updates.

Moreover, I got you this article that can help you in modifying your invoice based on your preference: Customise invoices, estimates, and sales receipts in QuickBooks Online.

I'm all ears if you have any other questions or concerns with your invoice and QBO. I'll be more than happy to help. Have a good one!