Hyperlinks from WIndows are getting deleted in iOS

I have created a number of hyperlinks to files (on my Windows machine) by dragging and dropping the files into Scrivener.

I sync the Scrivener file through Dropbox so that I can do some typing on the road using my iPad. However, all of the hyperlinks get converted to plain text as soon as I edit anything on the page in iOS. When I open Scrivener back up on my Windows computer, all of the hyperlinks are non-functional.

Please note that I don’t type over or even touch the hyperlinked text in iOS. I’m simply typing new text at the end of a document and then saving the changes back to Dropbox.

Is there a way of preserving hyperlinks between saves while editing on iOS and Windows? Is this expected behaviour or a bug?

Thanks in advance.