Appergioz

Hi all, I have a question in using SmartShare on LG WebOS 2.0 (my LG TV is 43UF770T, a 2015 model). Recently I often use the TV to view pictures from files located in my NAS through DLNA capabilities in SmartShare app. I found out that when I view pictures with resolution smaller than 4K, then the pictures are shown in the center of the TV screen and cannot be shown full screen (automatic best-fit). This is quite annoying because when viewing older photos taken from old phones with 1920 x 1080 resolution for example, then the picture will look small because it is not shown full screen. For comparison, when viewing video files, the TV automatically resizes the images until best-fit full screen, i.e. video with smaller resolution than 4K still shown full screen. This is exactly what I want. Does anyone here know how to get full screen image shown for smaller pictures (auto resize upscale to best fit full screen), just as with video files in SmartShare? Many thanks in advance.