Using refresh token in Dropbox Out Node

I am trying to copy data from a raspberry pi to dropbox using node red - so that I can access the data remotely and in real time (i.e. the data is updated every 10 mins or so). This works well when I use an access token from my dropbox app and put it in the dropbox node, however, these tokens expire after a few hours.

I have since generated a "refresh token" from dropbox, which is supposedly long lasting - however, the dropbox node says it is an invalid code. Does anyone have any experience on how to sync data to dropbox long term? Or any other ideas on how to sync data remotely and long term from node red?

Many thanks,

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