The app isn't in control of that. The instance you're on is. I've only heard of one instance that allows direct uploading of video and gifs, and IIRC, it was Kbin. For others, you can only upload images; videos and such need to be linked.
To be clear, Kbin is not an "instance". In fact, Kbin is not Lemmy. It's a completely different thing than Lemmy. It's like a mix of Lemmy and Mastodon. The image-only upload is a Lemmy limitation (not changeable by instances).
The app isn't in control of that. The instance you're on is. I've only heard of one instance that allows direct uploading of video and gifs, and IIRC, it was Kbin. For others, you can only upload images; videos and such need to be linked.
To be clear, Kbin is not an "instance". In fact, Kbin is not Lemmy. It's a completely different thing than Lemmy. It's like a mix of Lemmy and Mastodon. The image-only upload is a Lemmy limitation (not changeable by instances).