I don't see this info on the product page but people have posted that music, Kindle books, and audiobooks can't be put on an SD card.
I suppose that you might be able to get around some of that by storing stuff on the SD card and using a file explorer to move things into main memory before using them -- always supposing that the files are recognizable and that the device storage isn't hidden or locked.
The product page does mention that some apps can't be moved to an SD card.
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