200g Micro SD

Ok, just wanted to make sure this was in the correct forum.
 
Note that on Amazon they have 200GB Micro SD Ultra cards for sale at $59.99 and same card for $319.00. (Different vendors) When you click on the $59.99 one it suddenly goes up to $119.84.

Maybe the cheap one is a fake?
 
I can't seem to write to the SD card t unless copying over from a computer hook up- i.e., I cannot transfer from the internal storage to the SD card- is Android still blocking that ? or is it a formatting issue ?

Also- cannot attach a Dropbox file to an email as the "my cloud " option isn;t attaching to Dropbox form inside the Attach option in the email dialogue... any thoughts there too ?
 

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