So I'm on my iphone, iOS 12.4.1, iphone XS (but I've seen this on other phones).
I view a photo or video in the Photos app.
I hit that "share" button, I'm not sure what you call it, the square with the arrow coming out of it.
In that dialog I have one item selected.
I tap the dropbox icon in the list of app options.
I then get a dialogue with; and option message field, a 'save to' option to choose folder, and a "to email, name or group" option. There is a cancel button, and also a "post" button, but the post button is grey and inactive. Am I doing something wrong here?
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