I do this for my memes so I can find them quickly. Image uploads will often pick them up and place them into the alt
attribute:

If dealing with gifs, it's a good strategy to upload them to tenor and tag them appropriately.
https://tenor.com/view/vitalik-buterin-hive-approves-clap-gif-20745680
Then, they show up in discord gif pickers:
As well as twitter:
By the way, eventually, tenor uploads show up in google search results. I just did that vitalik clapping gif yesterday, so it's a little too soon. Here's one I did a few months ago: