Note for POCO F3 (maybe others too):the icon in the top right corner of "Install via USB" will not show until Settings > Additional settings > Developer options > Turn on MIUI optimisation (at the bottom) is OFF.
Note for POCO F3 (maybe others too):the icon in the top right corner of "Install via USB" will not show until Settings > Additional settings > Developer options > Turn on MIUI optimisation (at the bottom) is OFF.