Dropbox api works in Development env. but not in Production env

Hi, i am facing a problem with the dropbox api right now that i can’t understand.

In the Development enviroment (Localhost) it is working, i am uploading files through my form application and i can also delete them…

I am using it like this

But if i upload my form application on the production enviroment, it does not work.
Maybe i am doing something wrong with the uploading part ?
I am doing a typical upload through the ftp server like this…

Can anyone help me ?

I don’t use that API, but you should deploy with Common Libraries ticked

still not working… i upload the _lib file with the latest version

Sorry then I have no idea