you can also hotlink some images hosted on other sites. I say "some" as different sites have different attitudes to hotlinking, as they may be sensitive to people effectively stealing some of their bandwidth.
As long as the image ends in the suffix .jpg, .jpeg or .png it should display as long as the host site doesn't have hotlinking blocked. Some media sites carry images which can't be hotlinked in this way as their URLs don't end in any of those suffixes. As mentioned elsewhere in the replies, you need to use the post preview function to check whether the image will display on DU.
Twitter images can also be hotlinked, but it's a little more involved. If you see a Twitter image you want to post, say you're using Firefox, you need to left-click on the image so it displays in isolation, then right-click on it and a variety of choices will appear. Select Copy image link then you can paste the URL into the DU posting or reply box. Choosing a random image I found, you'll end up with a URL something like this:
https://pbs.twimg.com/media/FkavoqmWIAIh7W1?format=jpg&name=large
You need to delete everything from the ? onwards (including the ? ) and replace it with .jpg. It should then display like so:
Be aware that some on DU are sensitive to Twitter content, especially since Musk took over. They're unlikely to object to a simple image as nobody will necessarily be aware of where it's from.
Some GIFs will display on DU, but it's hit or miss whether you can find one that ends with the suffix .gif - some GIF hosting sites have sharing tools which will help.
You can also post YouTube content. You just need to copy the URL from your browser's navigation box and paste it, and it should embed and play when clicked on.
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