I cannot add to an invoice on my phone app, it will not save, and support link from that won't accept multiple phone number it asks for it.

Thanks for posting in the Community space, info244. I want to ensure you're able to create an invoice.

If you're trying to add an attachment to an invoice, please know that there are a few accepted file types that you can attach. These are:

• PDF
• JPEG
• PNG
• DOC
• XLSX
• CSV
• TIFF
• GIF
• XML

In the meantime, we can clear the app's data to refresh QuickBooks and fix any common issues when using the account. Here's how:

Android:

1. Press the menu at the top right.
2. Choose Settings.
3. Select Refresh Data.
4. Click Yes.

iOS:

1. Select the menu at the top right.
2. Choose Help & Feedback. 
3. Select Refresh Data and Refresh.

For additional troubleshooting options for Android, you can check out this article: Fix common errors in the QuickBooks Online mobile app for Android.

To learn more about attaching files to your transactions, see this article: Attachments in QuickBooks Online.

Keep me posted on how things go on your end, info244. I'm looking forward to your response. Have a great day.