Hello there
@NpW, thanks for reaching out to us here!
Since there is no official integration with these at the moment, I'm afraid there isn't much I can suggest other than manually saving the files to Dropbox.
We do currently have a request for this
here, if you'd like to check this out and add your vote to show your support.
Sorry that I can't be of much more help with this, but please let me know if you have any questions!