Hi, I had the same problem, my solution was to deleted the Desktop App in the OAuth client ID and created a new one selecting Web Applications instead, followed the instructions and worked out of the box.
Later on if the creation of the gallery in any page in your editor keep loading eternally, just click out of the loading windows and save the changes, after sometime it works!
Thanks @@sayontan for your amazing plugin!
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This reply was modified 9 months, 3 weeks ago by Vlad Wood.