Error (400) Invalid redirect_uri

[KyCham]

I'm trying to import Dropbox files to Draft.com, but get this error message:

Error (400)

It seems the app you were using submitted a bad request. If you would like to report this error to the app's developer, include the information below.
More details for developers

Invalid redirect_uri: "https://www.filepicker.io/api/client/dropbox/authCallback/open": It must exactly match one of the redirect URIs you've pre-configured for your app (including the path).

[Greg-DB]

This error message indicates an issue with the third party app's configuration. The developer of the third party app will need to correct the configuration of their app to fix this. You may want to reach out to them to ask them to fix it.