1 - sounds like you are confusing a Master Source and a Source Citation
- in Lists > Source List you are looking a Master Sources
- in the Citation Manager in an Edit Person screen, you are looking at a Source Citation
2 - a Source Citation is a specific use of a Master Source which includes the page # and other details
3 - images can be attached (or linked) to several places in RM
- they can be attached at either or both of the Master Source or Source Citation
4 - if you use a Master Source for multiple different citations, then you probably don't want to attach an image there
- for example, if you have a Master Source for a printed school yearbook, and you want to use that Master Source for two different people who appear on different pages of the yearbook, then I would recommend linking the images at the Source Citation level
- on the other hand, if you have a Master Source for a Boston city directory, and an image of one of its pages listing several family members, you have one image that applies to all of those people, and it may make sense to link the image to the Master Source (unless you will also use that same Master Source for another family on another page)