That’s one of the more annoying announcement formats that I’ve seen, but it is effective in highlighting what exactly has been updated, and how you can use the expanded carousel option.
As noted, Instagram expanded its carousel posts to 20 frames last month, and as such, it’s not a huge surprise to see Threads do the same.
Though they’re not quite carousels, at least in the same way. Carousels on Threads are just multiple images added to an update, not a specific format as such. But the effect is the same, and having the capacity to add up to 20 images and/or videos is significant, and will expand your Threads posting options.
Källa: Threads Users Can Now Add up to 20 Photos And/or Videos per Post
