Galaxy S4 stock 4.2.2 and rooted if that makes any difference.
Yesterday I finally got around to shifting my entire music collection to my external SD card, and then I uploaded all my music to Google Drive as well for safe keeping. Woke up the next day missing over 1.5GB of internal storage space. I checked Android assistant and my thumbnail cache was 1.88GB. It's usually pretty high anyway since I have dozens of podcasts, videos, and even some full movies on my external SD card, but now it's ballooned out of control. How can I stop Android from forcing these thumbnails that I don't want associated with my files?