How do you export an image/or in what format, once you have added a hyperlink to the image please, so that it appears as an image and not a file? To appear as a clickable link on Facebook and Twitter.
Images are inherently not clickable. They are images. One common solution is to run your own server on your own domain, put the images there, and edit the servers htaccess file to make them clickable. Then post that to the social media site. To make clickable images, is a coding solution, not a graphics one.
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Usually people export as JPG format then upload to facebook or social media. Then assign HTML link there. Note: exporting at 1000 pixels at the longest side of your art is usually plenty. For Twitter, I export at 500 pixels max. size.