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How to go about a secure file-storage, user authentication and downloading files

I am trying to create an application that will allow a user to login and then view/download their corresponding business files (excel documents etc....). Does anyone have any ideas on how to go about this? I am fairly new to development so this will be my first massive project and understand a lot of learning - trial/error will be done along the way.

I was planning on using express for the back-end and react for the front end. Does anyone have any experience with this and have any recommended stacks/starting points. I have been searching for a while and was thinking about storing the files on my own server in separate folders for each business (about 10 max) but was unsure. Any help would be appreciated.

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