Downloaded Content missing

I have attempted to download a PPTX to my Shared Content folder and I get the processing error message.  I try to download again and the system tells me I already have a file by that name, but I cannot find the partially downloaded file to delete it and try again.  I am trying to maintain a strict naming convention with these presentations and would like the corrupt version removed so I can attempt to save it again under the same name.  Anyone have this issue??