Issue #2936293 by xjm, tedbow, marcoscano, ershov.andrey, phenaproxima,...

Issue #2936293 by xjm, tedbow, marcoscano, ershov.andrey, phenaproxima, benjifisher, samuel.mortenson, davidhernandez, tim.plunkett, Gábor Hojtsy, seanB, ckrina, yoroy, DyanneNova, amateescu: At least inform content authors where they can list and add media

(cherry picked from commit 05039c6a)