I use aspose.words 15.12.0 with license. I tried to insert many documents into one document using InsertDocument method and received the exception saying too many styles when I reached certain number of insertion. When I tried 4000 insertions, it worked. It throws exception when I try 5000 insertions. I wonder if I reach the limit of aspose.word, or there’s another way to insert documents and generate huge document. I attach here the code, the two documents for you to try out.