Hi Michelle,
I think what you are seeing is that editing images or adding new attachments when editing an existing record/survey is not currently supported in Survey123.
When you open a new survey (new collect) you can add new images via the camera icon or browse gallery icon. However, when you are editing an existing survey via the Inbox or Sent box, the adding or editing of attachments (images) is not supported and those icons will not be displayed.
There are many other posts on this subject, with workarounds such as using a repeat in your survey, to be able to add additional images to the survey. We are hoping to support the editing and adding of attachments when editing an existing survey record in the future.
Regards,
Phil.