I have three kindle files
I have DRMed them using Calibre 3.31.0 for mac with DeDRM Tools 6.6.1
I have exported the resulting azw3 using Kindle Previewer 3.27 to AZK files
I sideload AZK files to my Kindle for iPad using iTunes
Books appears successfully on Kindle for iPad but with one problem; each book overwrites the other one. An important note is that all three books are from the same publisher
Other books from other publishers appears without any issues
I have DRMed them using Calibre 3.31.0 for mac with DeDRM Tools 6.6.1
I have exported the resulting azw3 using Kindle Previewer 3.27 to AZK files
I sideload AZK files to my Kindle for iPad using iTunes
Books appears successfully on Kindle for iPad but with one problem; each book overwrites the other one. An important note is that all three books are from the same publisher
Other books from other publishers appears without any issues