Hi Jennyaus
Thank your for your post. As of the moment we can only work with in Tray attaching documents if you're file is online and it cannot be done on sales, it is how our system currently works. However, you can attach some documents using the attachment button inside in tray or directly attaching documents when you create purchases. More information about this can be found on our Help article, Working with in Tray documents.
Nevertheless, thank you for your feedback and rest assured that we will pass this through the required team to see if this feature can be added. Additionally, you are welcome to submit ideas on the AccountRight Idea Exchange for consideration by the development team.
Please feel free to post again I'll be happy to assist.
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Cheers,
Princess