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In some circumstances, you may not be able to view the Upload and Review button, nor scroll down to see it, after selecting your file.
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Depending on your browser, you can use the following steps as a workaround.
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Chrome (and Chrome-based browsers e.g. Edge, Brave)
Right click on a blank space in the Turnitin Assignment Inbox.
Click View Frame Source.
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In the new tab or window, copy the entire URL, starting with httpswith https://api.turnitin.com/... 
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(Deleting view-source: will not work.)
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Continue with your submission.
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Safari
Right click on a blank space in the Turnitin Assignment Inbox.
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Continue with your submission.
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