there is this issue when opening pictures from directory opus were "Photos app" wont recognize
that there are more pictures on the folder and wont shot next/ the arrow ill illustrate with images for clearer understanding
PSA Qview if you just want to see you pictures and be able to use you arrows absolutely 0 clutter and it works with directory opus + its opensource and does not require admin privileges
(is you are interested GitHub - jurplel/qView: Practical and minimal image viewer it seem it would go well with opus for easy preview before opening Lightroom) it does not work with RAW files so use the jpg+raw if you wanna use this solution