I recently used www.draw.io and saved my sketches on dropbox. It asked me to authorize access and created a folder under Apps. When I look at the account/security page, the access type is App folder. When I go to draw.io website and go to the open document window, I can see that the app has access to all my dropbox and can open any file. Why is that?
Are you referring to the functionality shown in this screenshot?
When using the Dropbox Chooser, the app only gets access to the specific files you select. The Chooser is actually part of the Dropbox site, so you (and only you) can see the rest of your Dropbox when selecting files to send to the app. The app just receives links to the specific files you selected once you click "Chooser".
In this case, draw.io uses the Chooser to let you select files to open from anywhere in your account, and then saves the edited files back to the app folder.
Hope this helps!
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