Yes, you can definitely upload more than 1 attachments in QuickBooks Online. All you need to do is press the CTRL button in your keyboard to select multiple files to attach.
To add attach files in the Attachments page:
Go to the Gear icon and select Attachments.
Click the Attachments icon to open the files.
Hold the CTRL button on your keyboard and select the items to upload.
Once everything is selected, release the CTRL button and hit Open.
I also encourage you to visit our QuickBooks Online Australia Resource Page to get helpful tutorials and guides about our program. Click this link to our website: QuickBooks Online Australia Resource Centre.
If you need further help with this topic or anything about QuickBooks, let me know in the comment. I'm always here to help you. Have a wonderful day!
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