I've had a few problems with a share from my client: client uploads high-res files in a .zip file name folder within which there are the individual files making up the page - InDesign packages which include pictures and artwork files. I go in to Dropbox to download these files - either to my own Dropbox or direct to my Mac. I open up the files and it looks like the files are there but it is only the file structure - absolutely no data. I am mystified how this is. I try to preview a file on Dropbox - like a jpg and in file info it is 0x0 pixels. Is it because of the .zip file extension confusing the file/compression? I've attached a few screenshots. Client is working remotely but files do seem to upload ok.