This is an old question from stackoverlow which uses boxselect aka box file picker popup. The usage is very simple and straight forward but very old.
But when i went through the dev docs none of them showed how to use the box file picker only using client id.
Below example shows only via access token. In integration apps page it mentions “strongly recommend that you do not send it to an end-user client for both primary and secondary access token”
https://developer.box.com/guides/embed/ui-elements/picker/#sample-html
if I use the client id in above example, no files are loaded. Now how do i integrate box in my web app.