Downloading using Android device, missing download button

I work in an industry where a number of clients use Box as a file delivery platform - however, as a part of this industry, I also find myself away from my desk and laptop on many occasions. The clients will send me the files to process, I want to do so on my Android tablet on the move... however, if the link is not part of a folder on their account, while the file is showing as previewed in the center of the screen, the Download dialog is absent from the top of the screen, when they would show up on the laptop versions of the browsers. (This happens in both Edge, Chrome and Brave mobile browsers.)

Is there a way of showing these dialog buttons for me to move forward, either as a 'brute force' solution or as a workaround within the Android APK? When I install the Box app on my device, when I click on the link within a sent email, it then opens the app but doesn't show the file for me to work on - all very frustrating. If any of this makes sense, or if anybody has any questions to help me solve the issue, please let me know.