There is 3 cases in fact :
- first it assumes the images are in the same folder as the .pano file. In this case, even if the path stored in the .pano is wrong, it makes the correction automatically without prompting this dialog box.
- If you have this dialog box, the bottom button allow to change the path for all the files : select a new folder, it will then check against all images which one are now good or wrong.
- Finally, you can change just one image location, one by one, by using the "..." button near the file name.
I can't find that in the present user manual (I missed it?) and suggest this thread being moved to the Idea for documentation sub-forum.