SD card not detected on Meural Canvas II

I've learned a lot by working with a Netgear engineer (NOT in support).  First thing was learning how to insert the SD card properly; you insert it with the contacts facing OUT.  That resulted in my canvas finally detecting the card.There are undocumented limits on the number of pics in the meural folders.  I tried a folder with 13,000 photos and the canvas could still detect the card but was not able to display the images.  I made 4 folders of 3,400 images and it works fine.  I tried 4,700 images and it does not work.  So the limit is somewhere between 3,400 and 4700😃.