Opening files from Dropbox on Pages/Numbers/Keynote iPad apps

I'm attempting to open the files from WiFi; I've tried two different networks at this point. I've attached screenshots of what I see just before and after tapping the desired file.Error after tapping file.Before tapping file to open Keynote presentation

If I am in the Dropbox iOS app, I oddly can't open files into the respective iOS Pages/Numbers/Keynote app. If I export the file, I get the invalid file name message below; copying a link allows me to open the file, but creates a new file path that iOS auto-saves to iCloud.

Error message after exporting

The occasional file will download and open without a problem. The issue isn't characters in the file name, as some with parentheses, periods, or commas will open, and some without them will not open.

I tried that, and from tapping on the files in the iOS Files Manager don’t produce anything — not even a download circle that won’t fill or even an error message saying that the file won’t open. (It won’t, also, allow me to view the file “info” accessed by pressing down on the file icon and tapping the black “info” box that pops up.)

As I’ve poked around more, I’ve noticed that some files are accessible and others aren’t, but I can’t see what the distinction is between them.

Having the same issue on ipados 13.1. 

Cant open dropbox files from Keynote, Pages or Numbers..   can browse teh dropbox directory, see teh files - but tapping on one to download I get a spinning circle forever.  

I can open teh files in teh dropbox app, and then open in..  but I dont want to keep a local copy.

I'm having very similar problems. Brand new iPad Pro, all latest software and ios. Can't open (large)Keynote files on iPad, neither via Dropbox direction nor via Keynote directly, even after data is ostensibly downloaded into Dropbox.

need Help, this is unworkable for me.

Thank you !

Same problem. But, keynote files open from iCloud Drive.  Hope it helps!