While you are logged in to the Adobe Content Viewer application on a tablet device, attempts to download large unpublished folios fail. (Unpublished folios have a blue banner in upper-left corner.) Sometimes, an error occurs, such as the following:
"Cannot connect to server at this time. Please try again later." or "Error during download. Please resume your download later." or "Error during download. Could not download a file."
The update, which contains changes specifically to address this issue, can now be found in the Apple App Store:
With this update in place, it's unlikely that you would need any of the remaining solutions, but they are documented here for thoroughness
You can use many methods to minimize folio content. One of the most obvious is to remove embedded videos and have them served through web content overlays instead. Any method that helps to reduce the folio down to something below 100 MB is beneficial.