How do I transfer .aif from Dropbox to cubasis?

Wow. Just need to vent as this is really frustrating. One would think this would be a simple thing to do. It is with auria. I uploaded the files to documents, Hokusai, and audio copy… And the best I’ve gotten so far is an export from Hokusai, which was converted to a stereo file. This is a time sensitive project and I don’t want to use auria. If anyone is reading this, please help ASAP? I just want to find the best way to transfer aifs from Dropbox to cubasis. One would think this shouldn’t be rocket science? Hoping its a simple thing that I’m simply missing. Still a PC guy, wrestling somewhat with the ipad, but want this portability.