sd card not recognized

Just received the new Tripltek 8 inch tablet - all very good - except it will not see the SD card. I've tried different cards (Sandisk high speed, etc) but the device will not show the card in storage, only 'internal storage'. turned off, I've re-booted but no response. Any ideas before I...

My Mavic is three months old and relatively trouble free until now. Getting an intermittent SD card not present (though it is in there) and no gimbal control on the remote. When it does work, the SD card will format and the gimbal will calibrate. Had it out this morning and on power up said SD...