One invoice was issued, and later it was modified several times, will quickbooks record these activities in the backgroud? and how can I view the modification hisotry?

QuickBooks Online has the audit log, makkahtourismjer.

You can see the company's activities with this feature. Here are some examples:

• user login/logout activity
• settings changes
• customer transactions (invoices created, or modified)
• vendors and employees

The name of the user, date of the activity, type of change, and the original transaction will be recorded.

You can access and view it here:

1. Click the Gear icon. 
2. Select Audit Log.
3. Select Filter.
4. Use the fields on the Filter panel to choose the appropriate User, Date, or Events filter to narrow the results.
5. Select Apply.

If you have additional questions about audit log, you can always leave a comment below.