I upload the image to the free site Postimages.org. On the Upload Completed page there will be various options including 'Direct Link'. I copy the content of Direct Link to my clipboard (ctrl/c)
Then on Dockside select 'image' below the massage text box. Into 'Image URL' paste (ctrl/v) the direct link. Select 'Add'
The text that will appear will be something like https://i.postimg.cc/wTyKR0yx/Trident-Isaac-Sweers.jpg with (img) before and after
To check all's OK select Preview and the image should appear replacing the text eg Dutch Leander
Hope this gets you there.
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