You can post a link to an Imgur album like this post did. It is not free and charges a little bit for its API but it is the most widely supported image host so some frontends have an Imgur gallery viewer built in. That’s what Reddit users did before the long-overdue introduction of native albums.

However, there will likely be no preview in feeds. Look how your app handles it by visiting the user’s page: @Prismo@lemmy.world