How to upload a picture as my thumbnail

It keep showing up as upload error when I publish it and can’t seem to get it in, Mine is JPEG and 313X200
Can someone help

Possible solution:
Try converting to PNG.
Also suggestion, try to remake the thumbnail in at least 1280 X 720 if you want it to look nice

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It needs to be Png Though… I thought.

It’s still not working pls

Well maybe the image is too small but I am not experienced on the subject

Ok, it says error no matter what I put