You can't well at least you can't upload. You'd have to upload the picture online somewhere and copy the direct link and then click on the image next to the smiley face and paste the link there and it should insert the image. I use https://imgbb.com/ to upload photos.
Also for the website if you make an account it will let you choose to select the direct link in the embedded coding.
You can't well at least you can't upload. You'd have to upload the picture online somewhere and copy the direct link and then click on the image next to the smiley face and paste the link there and it should insert the image. I use https://imgbb.com/ to upload photos.