Using either the "Share" or "Export As" options, after the file is rendered for export you should be presented with the destination panel. There should be a horizontal line of app icons which will show often used apps, if Flickr is not shown in that list scroll to the right-hand end and there should be a "More" icon. Tapping on that should give you a vertical list of "Favourites" and "Suggestions". On my iPhone, Flickr appears in that list of suggestions, though I guess it will only appear in th
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