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Before uploading files to Box and previewing them using Box View, a Box application must be created and an access token be generated for that application.

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Create App Token App

Box View uses an authentication mechanism called App Token Auth to store files directly within the account of the application as opposed to a specific Box user. This permits the previewing of files without having to associate the content with a user. The first step is to create the application and authorize it through your admin to begin making API requests to Box.

Setup and authorize App Token app
App Token apps need to be authorized by the Box admin, otherwise you will receive permission errors when making API requests. To go through app authorization, follow this guide.

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Generate Access Token

With your application loaded, click on the Configuration option in the left navigation menu. The configuration page for your application should look like the following.
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Click on the Generate Key button within the Primary Access Token section.
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If you don’t have 2FA setup for your developer account, you will be prompted to set up 2FA before you can successfully generate App Tokens. Follow the prompt to set up 2FA.
Choose the expiration time for your token, either 30 days, 60 days, or set the token to never expire.
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Once the app token is generated, copy and store it securely. It won’t be displayed once the page is reloaded since Box stores a one-way hash of the tokens instead of the actual token and cannot retrieve the original token again.