We have decided to proceed with the approach of having a server side which should accept the file upload to server first and then make the upload API call with my pre-defined access token on the server.
In this case, we need everything to be automated to refresh the access token within x days and no browsers/login prompt involved. Seems like its possible according to your reply?
Re: Uploading files to my predefined dropbox account bypassing authorization page
You don't actually need to "refresh" the access token. Dropbox API access tokens don't expire, so just be careful not to manually revoke it.
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