Why is it not possible to download a file easily on to IPAD???

Now and again I need to download my sound files onto Audio share or Ipads download folder but I always have this issue which is you can't download anything onto the Ipad, why is this??  Why is there no button that indicates a downloading option? it seems utterly bizarre to me.  Apparently there used to be an export option, where is it now?  I understand that 'sharing' your file is a potential option but it only lets me share the file via email or share a link.  I don't want to do that, I just want to download the **bleep** file, this is bonkers!  Does Dropbox not want you to access your own files on the ipad??