Need help with file uploads to Dropbox for a charity website

Ruslan Shastkiv wrote:

I have encountered an issue where my access token frequently expires.

Long-lived tokens were deprecated back in 2021 and can no longer be created. You now use refresh tokens to retrieve new short-lived tokens as needed. See here for more information:

• https://www.dropboxforum.com/t5/Dropbox-API-Support-Feedback/We-need-Long-live-access-token/m-p/629344/highlight/true#M29066

Ruslan Shastkiv wrote:

Ensure that the access token does not expire frequently, or suggest an alternative solution for continuous file access.

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. Refresh tokens do not expire automatically and can be used repeatedly. 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.