Is there a limit to the amount of documents i can upload?

I can share some information about the attachment feature in QuickBooks Online (QBO), @ronan_glynn.

There isn't a limit to the number of documents you can upload or attach to your transactions. For more information about those transactions that you can upload an attachment, supported attachment file types, how to attach a document, view, edit, or delete attachments, check out this article: Attachments in QuickBooks Online.

If you'll encounter errors when adding an attachment, check out this article to see the accepted characters for the file name: Acceptable characters in QuickBooks Online. 

Let me know if you have further questions about adding documents in QuickBooks. I'm always here to help. Have a wonderful day!