app dropbox

Dropbox is no longer offering the option for creating new long-lived access tokens. Dropbox is now issuing short-lived access tokens, which expire after several hours, (and optional refresh tokens, which don't expire) instead of long-lived access tokens. You can find more information on this migration here. The "Generate" button will now only generate short-lived access tokens for you.

Apps can still get long-term access by requesting "offline" access though, in which case the app receives a "refresh token" that can be used to retrieve new short-lived access tokens as needed, without further manual user intervention. You can find more information in the OAuth Guide and authorization documentation. There's a basic outline of processing this flow in this blog post which may serve as a useful example. You'd need to use the OAuth authorization flow to get a refresh token; the "Generate" button does not produce refresh tokens.

Note that this is something that would need to be implemented by the programmer of the app, so if you are not the programmer responsible for this integration, you may need to get an update from them to support this.