Library - Media - add media - file "plan.pdf" - give no specific Name - upload -->
media is in library, Name is "plan.pdf", file Name is "Plan.pdf" ok
Now do it again the same way, you get the message "You already own media with this name. Please choose another."
Layouts - make an empty one - choose PDF to add - select file "Plan.pdf" from your file System - upload without spedific Name
no error message, but new media in library witrh Name "Plan(1).pdf" and also the file Name
NO ERROR MESSAGE
your layout - designer - delete pdf in timeline AND in library
in preview of the canvas you can still see the pdf, but timeline is empty
library - media - add media - select the same file again and upload
you get plan(1).pdf as the Name and the file Name instead of plan.pdf
the only way to replace media in library is to use it within a timeline of a layout and edit. there is a button "replace" with the nesessary functions. This button should reside within "add media" and all other Dialog Windows of this matter.