Hi there,
Welcome to SeaTheme forum.
What’s the image file size what you uploaded? It may have triggered the maximum upload file size limit of you webserver. Please try to upload a small size JPG file to check if it works. Or stop all other plugins to check if it works.
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If it doesn’t work still, may I check your website? Could you please leave your wp-admin access (URL / username/password) by picking up “Set as private reply”?
ps: I cannot download your file of the monosnap url what you pasted.
Regards!
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