I don't use a special UX. But I have the following entry in the sys.txt:

[point]
picturepoi_has_mypicturepoi=1
picturepoi_scan="/storage/0123-4567/DCIM/Camera"
picturepoi_folder="/storage/0123-4567/DCIM/Camera"

Of course, the pictures must be in the listed directory and the name of the directory, for me the SD card, must be right.
That works for me igo Israel 9.18.27.681611 and basarsoft 9.18.27.736674