f_auto is not giving optimum picture format (PNG as standard)
When I use the following url I get a 225KB png image, just as if f_auto was never specified.
When adding a parameter to automatically choose quality, q_auto, the result is a 32KB jpg.
Changing "auto" to 50, as in q_50, will return to giving me a 225KB png, still paying no respect to the f_auto parameter that should choose the optimal format.
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