There is a bug in UMG 8.5 which affects the "Translucent" presetnation, a script error may fire if you are not using the default appearance settings, this bug is now fixed in UMG 8.6.

UMG included a "SmoothGallery" presentation since version 6.x, in UMG 8.6 we choosed a complete different image viewer for this presetation, for further information please visit our sample gallery.