My success in using Lumi Quiz based of a single course file (PDF) is inconsistent (mostly failed than passes unfortunately). Sometimes the generations work (when I specifically pick a Bloom's Taxonomy level instead of leaving it optional), sometimes it did not (and the error says that there is insufficient content). My PDF has 36 pages - it was a PPT file saved as PDF, but it does have text content. Any tips for me on increasing the success rate of Lumi Quiz?