How can I troubleshoot import errors? I purged my data and now I can't import invocies

I appreciate the screenshot you've shared, @mohamed-hasan-fo.

Let's first try accessing your QuickBooks Online account using a private or incognito window. This way, we can see if this a web browser related issue. You can use any of these keyboard shortcuts:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

Once you're able to successfully login, let's first check whether the invoice you've imported awhile age was successful. If it is not, let's try importing your invoices again. You can refer to this article for the detailed instructions: Import multiple invoices at once.

Once completed, you can open your regular browser and clear its cache. Some times, the data stored from your regular browser for a long period causes unusual behavior. Also, you can use other web browsers. 

Also, I've added these great articles for additional reference in adding your personal touch to your sales forms in QuickBooks:

• Import custom form styles for invoices or estimates
• Customize your invoices, estimates, and sales receipts in QuickBooks Online

Lastly, feel free to check this resource in case you want to learn how to link a deposit to an invoice.

Wishing you more sales for your company. We're just around if you need more help.