Open a Project.
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Open the Add-ons menu (click the plus icon or use /box).
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Hover on Upload File .
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Choose Box from the dropdown menu.
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Select the files you want to upload.
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Press the Select button.
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Confirm which files you want to upload and press Upload.

Open a Project.
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Click the Cloud Icon at the bottom of the chat box.
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Choose Box.
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Select the files you want to upload.
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Press the Select button.
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Confirm which files you want to upload and press Upload.

Open a Project.
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Open the Add-ons menu (click the plus icon or use /comment).
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Choose Comment.
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Click on Upload File .
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Choose Box from the popup menu.
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Select the files you want to upload.
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Press the Select button.
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Confirm which files you want to upload and press Upload.

Follow any of the file upload methods above.
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You'll see a sign-in window once you select Box from the prompt window.
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Log into your Box account with your email and password.
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Grant access to your Box account.