All files gone in ios

During a routine synch of only one mac project, all project files have been wiped clean from ios.

What are my next steps. Not a thing changed with file locations, dropbox, etc.

Problem resolved quickly by tech support Amber. Many thanks. Here is the link to details and solution:

https://forum.literatureandlatte.com/t/urgent-75-000-word-book-in-jeopardy/37439/14