I have a question regarding ISBN numbers, I bought ten and assigned one to the paper back on KDP then I uploaded to Ingram Spark thinking I needed to use a new one which I did for the same format. Now I am reading that is incorrect, and I should now unpublish on KDP and re upload my book using the same ISBN I assigned to the paperback on Ingram Spark, is that correct info? Also if I re upload my book to KDP using the same ISBN as IS do I mark it as a second edition? Thanks any insight would be appreciated.