I don't know much about kindle but I do have a Samsung android phone and I have tried the kindle app on it. When I purchased an Amazon free book (but with DRM) Amazon sent it to the phones main memory to directory
/sdcard/Android/data/com.amazon.kindle/files.
If I wanted to send my calibre non-DRM mobis to the kindle app, I had to put them in a different directory in the phones main memory, /mnt/sdcard/kindle
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