Thread:Project:Support desk/Unique name of graphics files?

Hello! My Mediawiki is now running quite nice, but there is one thing about using photos or graphics files that I don't understand at all. Does the uploaded files (.png) (.gif) (.jpg) bleong to one certain page or can they be used on many pages? Does a photo need to have a unique name like pageA-Photo1.jpg or is it OK with a number of 15 equally named photo1.jpg. If this is ok it it then some system or catalogue to browse trough the 15 different photo1.jpg, to reuse them one one other page? (Or can they only be used on one page?) May be I don't ask the question the right way, but thats due to the reason I don't even know how to ask the right way. I hope you can give me some ideas. Best reg Arne.