which file transfers software best to connect file to Trello

[Clay Copeland]

which software.. e.g.,Dropbox, google, allow you to connct to card and then be able to change the files in Trello and have original files also changed 

[milynnus]

@Clay Copeland as you perhaps already know, the files unless upload into Trello are links to the originating cloud. Any change will be made to that version. For uploaded it will have to downloaded for updates. I