Choosing the type
In the post editor, a channel that supports more than one type shows a type selector next to it. Channels with only one option don’t show a selector at all — which is why you won’t see it on LinkedIn or X.Reel only appears once the post has a video attached. If you’re expecting the option and it isn’t there, add the video first — Ocoya hides a type the post can’t currently be.
Reels
Facebook Reels are the tighter of the two by some distance — 100 MB and 90 seconds against Instagram’s 1,000 MB and 15 minutes. A video that’s fine as an Instagram Reel can easily be refused by Facebook, so if you’re posting one video to both, the Facebook limits are the ones to build for.
Both expect vertical video. Facebook checks for 9:16 specifically.
Stories
Instagram only.
A Story can be an image or a video, and the 8 MB image limit is the one that catches people — it’s tighter than the 8 MB that applies to a normal Instagram post only because story images are often exported at full resolution.
Thumbnails
Instagram Reels and Stories accept a custom thumbnail — the still frame shown before the video plays. Set it with Edit thumbnail in the Media panel. See Adding images and video. Facebook Reels do not accept one, and neither does standard Instagram video. TikTok doesn’t support custom thumbnails at all.Common problems
“The Reel option isn’t there.” The post has no video attached, or the channel is one that doesn’t support Reels. “It published as a normal post.” The type is per channel — check the selector on that specific channel rather than assuming it applied to all of them. “Facebook refused a video Instagram accepted.” Almost always the 100 MB or 90-second Facebook Reel limits. Shorten or compress for Facebook, or send the long version to Instagram only. “My Story image was rejected.” Stories cap images at 8 MB. Export it smaller.Related
Character and media limits
Every network’s limits for normal posts.
Adding images and video
Attaching media and setting a thumbnail.