You can attach photos, video or audio to your posts on Mastodon:
🖼️ Images can be up four PNG, JPG, HEIF, WEBP, AVIF or GIFs up to 16MB each
📺 Video can be MP4, M4V, MOV or WebM up to 99MB
🎧 Audio can be MP3, OGG, WAV, FLAC, OPUS, AAC, M4A or 3GP up to 99MB
Note that there is no length limit! You can post any length of video or audio as long as it is within the file size limit.
There is lots more info about attaching media to Mastodon posts at:
➡️ fedi.tips/how-do-i-post-images…
How do I post images, videos or audio in Mastodon? What can I attach to a post? How do I post GIFs? | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse
An unofficial guide to using Mastodon and the Fediversefedi.tips