just for example, back the clock of the server the number of days required, then uploading files using browser transfer, from the client to the server, so it should be dated a few days, and then deliver the server to the right date and preview the contents of the file from the browser, all files older than the number of days selected should disappear
IMPORTANT:
the files are not automatically deleted after the number of selected days, it's necessary that a person visits the web page containing the files concerned that they are effectively removed, this is the drawback of the simplicity of this solution
otherwise you have to make development, external to hfs, using a file containing the names and number of days of life for each of them, and manage the counting values,
if it is not too difficult to add data to each download for numbers of days from HFS, deletions management can be done at a certain time using VBS or BAT scripts from windows