Thanks for your help Ken, for each upload now have mkdir a new directory, then used rename to move the files 

Actually it overwrites the previous file, but again, with no alert or fix

Hi,I have set the uploader up and is working fine for multiple uploads, but wanted to test what happens if on a future upload someone uploads a different file with the same name as a previous file. It seems like it just ignores the new file but gives no error message.  Is this the case, and how can I fix it? Thanks