question

My recently downloaded music (sideloaded) is on my sd card, but not showing in music app. I already downloaded music in this way (from my computer hard drive to the kindle via USB) with no problems as recently as two days ago. Strangely, in music app settings there was a box I had checked that said music would download after restart (which it would), but now, that is missing from settings and new sideloaded music doesn't show in kindle (but again, IS on the sd card). Help. Thank you.