I am unable to edit existing invoices. Something i have always been able to do. When i click on save it kind of just freezes.

Good day, hello. Your correct invoices can be edited and saved, and I'm here to help rectify this problem.
 

Before anything else, may I know if you encounter an error message during the freezes? Please share the details so we can find an accurate fix.
 

For now, let's start accessing your QuickBooks Online account in a private window to address potential browser issues that affect the system's functionality. You can use these shortcut keys to access them:
 

• Safari 11 or newer: ⌘+ Shift + N
• Chrome: Ctrl + Shift + N
• Firefox: Ctrl + Shift + P
• Safari: Command + Shift + N

After you can log in using a private browser, switch back to your regular browser and clear the cache. You can also use another supported browser as an alternative.
 

Once fixed and you're ready to process payments, please refer to this article for guidance: Record invoice payments in QuickBooks Online.
 

Don't hesitate to ask help to the Community if you have any other questions or need further assistance. We're always here to help as much as we can.
 

Thank you Michaela, 

I have tried all of the above and still have the same issue. Once I go in to an invoice, edit the amount, and press save, the save button fades as if the page is loading. But then it just stays like that. I've noticed that if it's an invoice that has not been sent to a customer, I am able to edit it. 

I've attached a screen shot.

Your efforts are appreciated when editing invoices, hello233. I’m here to direct you to the appropriate support that can help you successfully modify your invoices.

Since the above solutions haven't resolved the issue, I suggest contacting our Live Support team. They can offer more tailored assistance and note the problems related to invoice editing.

To reach them, follow the steps below:

1. Go to the Help icon.
2. Click Contact Us.
3. Enter a brief description of your concern. Then, click Continue.
4. Choose either Start a Chat or Get a Callback to start connecting with them.

Additionally, I’ll share these resources that will assist you in sending multiple invoices and ensuring payments are deposited into the correct account:

• Set up and send progress invoices in QuickBooks Online
• Record and make bank deposits in QuickBooks Online

If you have any questions or need assistance with invoicing or other QuickBooks-related matters, feel free to share your comments below. I'm here to lend a helping hand. Stay safe.