As well as images, you can attach audio or video files to Mastodon posts. Here are some assorted tips:
-There is no length limit on audio or video files, but they have to be below a certain file size (usually 40 megabytes). Check with your server admin if you're unsure about the file size limits.
-You can replace the thumbnail with an image file by clicking on the "choose image" button.
-On audio files, remember to add a text description of the sound for deaf users.
-On video files, remember to add text descriptions of the pictures for blind users, and of the sound for deaf users.
-Silent MP4 videos will be treated as animated GIF images.
-Audio can be MP3, OGG, WAV, FLAC, OPUS, AAC, M4A, 3GP
-Video can be MP4, M4V, MOV, WebM
Thanks to the lack of a time limit, one legendary Mastodon post had the Angelina Jolie film "Hackers" ridiculously compressed to fit within the file size limit. It was unwatchable 😁
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