I tested using LF Snapshot on a few text files between 15-40 pages and everything worked fine with generating pages on them.
I tried doing the same thing on a 5000+ page text file but after the initial dialog where it was "printing" the pages into Snapshot, nothing has happened for a few hours. I'm not sure if Snapshot can even handle a document of this size. Is there another way we can generate pages on a document that is purely text?