When I take a photo of an invoice they don't always save.why is this?

I can help you with adding your invoices in QuickBooks Online (QBO), @vernonjlaslett. 

The issue you're having when trying to add a photo of your invoices can be caused by the piled-up cache in your regular browser. It stores temporary internet files from your browsing history. As it collects too many files, it can cause performance issues in your account.

I've got some steps to help fix this issue. First, sign in to your QBO account using a private browser. This helps isolate the issue since it doesn’t store data in the cache. Here are the following keyboard shortcuts: 

• Safari: Command + Shift + N
• Mozilla Firefox: CTRL + Shift + P
• Google Chrome: CTRL + Shift + N
• Microsoft Edge: CTRL + Shift + N

If it works, here's how to clear cache and cookies to fix issues when using QuickBooks Online. Restart your browser right after. 

You can refer to the following article for more information about uploading your receipts and bills to QuickBooks Online. It'll guide you with uploading and reviewing them right after. 

Let me know if you need further help with your invoices. I'm always here to answer them for you. Have a great rest of the day!