Select files and goto the appropriate file.
it does depend on your photo and size of image - if you have that "live" photo on it won't load and some photos are too big data wise - for these I stick them on a basic editor and resave at a lower quality
I think my photos on my iPhone are set to jpeg rather than Heic(I think thats the format) as I now use photos in the larger quotes where we are doing multiple areas
Darran