Currently, uploaded files default to private visibility (only the uploader can view them). One use case where this comes into play is the case of a team landing page with headshots for each member of the team. What typically happens is that a user will upload a headshot, insert it in the wiki page, verify that it looks good, and then move on. Other users, however, will only see a bunch of broken image placeholders (e.g. "\{F1234, height=60, width=60\}") since they are unauthorized to view the image. This seems to be a pretty counter-intuitive default judging by how often this occurs, and since Phriction is primarily a tool for collaboration rather than data storage there doesn't seem to be much of a downside to making visibility default to the "All Users" level.