Marc Barrot: If you need to store a graphic in a Radio UserLand or Frontier database, use the Quick Script window to call html.commands.loadImageFile(). A file open dialog box appears. The graphic you choose will be stored in the user.html.images table.
Easier yet: Tools->StaticSites->Load Image File.
For those moving from Frontier to Radio: The Tools->StaticSites menu contains the static site management tools found on Frontier's Web menu.