If you're on an instance running the latest version of Mastodon, you may have noticed the image attachment button has turned into a paperclip 📎
This is because you can now attach lots of different kinds of media: images, video and audio 👍
The supported file types are:
JPEG/PNG/GIF for images
MP4/WEBM/MOV for video
MP3/WAV/OGG/FLAC for audio
There's a size limit of 8 megabytes on images and 40 megabytes on video/audio.