Im having trouble updating my invoices and also adding material to my estimates.

Good morning, forthecrossweldi.

Thanks for reaching out here in the Community. I'd be glad to lend a hand so you're able to update your invoices and add info to estimates in QuickBooks Online.

As an initial troubleshooting step to rule out any browser related issues, I recommend clearing the cache. The browser cache collects stored data to make loading web pages quicker and easier. If it becomes too full it can sometimes cause viewing and performance errors. Clearing the cache forces the system to refresh and will resolve these types of errors. Here's how to get this done in Chrome:

1. Click the three vertical dots in the top right corner.

2. Select More Tools, then Clear Browsing Data.

3. Change the time range to All Time.

4. Only check Cached images and files.

5. Click Clear data.

If you're using a different browser, you can check out this article for similar steps: Clear cache and cookies to fix issues when using QuickBooks Online

Feel free to follow up with me here and let me know how things look after giving this a try. I'm just a comment or post away if you need assistance with anything else.