How to Auto-Post AI Videos to YouTube Shorts (Title, Tags, Playlist and Schedule)

To auto-post AI videos to YouTube Shorts, connect your channel once in ReelMint, open the video, press Share, pick the YouTube destination and choose Short as the format, then publish now or set a time. ReelMint uploads it with the title, description, tags, category, playlist and visibility you set on that tab, and YouTube files it as a Short when the video is square or taller and three minutes or under.

We build ReelMint, an AI video studio that also publishes, and this guide covers exactly what the YouTube tab does, where YouTube's own rules decide the outcome, and the daily upload limit that catches most new channels.

Step 1: connect your YouTube channel

1. Open Channels in the top navigation and choose Connections.
2. Press Connect on YouTube. You are sent to Google's own sign-in and consent screen, where you approve a publishing permission.
3. You come back to ReelMint with the channel listed as connected. The Channels menu shows a filled dot next to every live connection.

ReelMint never sees your Google password. It stores an encrypted access token, and you can revoke it from your Google account at any time. Connecting needs no subscription; a plan is needed to generate, upload and post. You can connect more than one channel, and every video can target any subset of them. The connect-your-channels guide walks through every platform.

Step 2: open a video and fill in the YouTube tab

Anything in your Library can go out: a clip made in Mint Studio with Seedance 2.5, Kling 3.0, Wan 3.0 or Veo 3.1, a Mint Moments film, or a plain upload (video, image or GIF, up to 50 MB). Open it, press Share and tick the YouTube channel. Its tab has these fields:

• Format: Regular video or Short. More on this below.
• Title: required, up to 100 characters, with a live counter.
• Description: up to 5,000 characters.
• Tags: up to 15. These fill YouTube's tags field, which takes multi-word search phrases rather than hashtags.
• Category: YouTube's own category list.
• Visibility: Public, Unlisted or Private. Public is the default.
• Made for kids: YouTube requires this declaration (COPPA) on videos made for children. It turns off personalised ads and comments on that video.
• Playlist: pick one of the channel's playlists, or type a title. A title that does not exist yet is created on the channel as a public playlist, and new uploads are added at the top so it reads newest first.

The AI title + description button writes the title, description and search tags from the video for 1 credit. Find viral hashtags (5 credits) researches what is ranking on the topic right now and drops the results into the Tags field.

Shorts vs regular videos: what actually decides it

YouTube's API has no "this is a Short" switch. YouTube classifies an upload as a Short when the video is both square-or-taller and three minutes or under. So the shape of the file is the only lever, and the Format toggle works with that:

• Regular video (the default) uploads the file exactly as it is, never padded or re-framed. A vertical clip of three minutes or under will still be filed as a Short by YouTube itself; anything longer, or landscape, is a regular video.
• Short uploads a square or vertical file untouched. A landscape file is placed on a blurred 9:16 canvas (1080x1920) so YouTube accepts it as a Short.

Under the toggle, ReelMint reads the file and tells you whether it qualifies, for example "This video qualifies as a Short" with its shape and length. Two caveats worth knowing before you press Share:

• Length is the one thing ReelMint cannot fix. A Short request on a video over three minutes is uploaded, and YouTube files it as a regular video.
• The choice only goes one way. A published Short can never become a regular video, which is why Regular is the default.

The easy path is to generate vertical in the first place: pick 9:16 in Mint Studio when the model offers it. Bot Studio films 9:16 by default whenever the model offers it.

Step 3: publish now or schedule it

Press publish to send it immediately, or set a date and time on the YouTube tab. Every destination has its own time, so the Short can go at 9:00 and the TikTok version at 18:00. The scheduler checks every minute, so a 9:00 post goes at 9:00. Google access tokens last about an hour, so ReelMint refreshes the connection just before each upload; a session that expired overnight does not turn into a missed post. Scheduled posts are listed on the dashboard and can be cancelled before they go out.

Uploads go up in 8 MB chunks, and a chunk that stalls is resumed from where it stopped rather than restarting the whole file.

YouTube's daily upload limit

YouTube caps how many videos one channel may upload in a rolling 24 hours. This is a per-channel limit, not an API quota, and YouTube does not publish the number; newer and smaller channels hit it sooner. Deleting videos does not give uploads back. When a channel hits it, YouTube returns uploadLimitExceeded, nothing is posted, and ReelMint:

• tells you in plain words that the channel hit YouTube's daily upload limit,
• pauses that YouTube destination for 24 hours, so the next scheduled posts fail fast instead of piling into a limit that is still in force,
• shows the pause on the dashboard. It lifts by itself.

If you run a daily bot plus manual posts on one channel, spread the schedule across the day and across channels rather than queuing a batch for one hour.

What it costs

Publishing and scheduling to YouTube cost no credits. Generating the video is what spends credits, and the price is printed on the Generate button before you click. The optional AI title (1 credit) and hashtag research (5 credits) are priced on their buttons. Plans start at Lite, $9.99 a month for 800 credits, and every plan runs every AI model. To see the finished output before paying anything, new accounts can claim the free example creations with no card, and post one to a Short.

Posting Shorts on a schedule without touching it

A manual Share is one video. For a channel that posts daily, Bot Studio generates a new video on a wall-clock schedule, writes the YouTube title, description and tags for each one, and uploads it to the channel and playlist you picked. The autopilot page explains it, and the one-minute connect and auto-post tutorial shows the whole loop.

Does ReelMint upload to YouTube as a Short automatically?

Only when you choose Short, or when the file is vertical and three minutes or under, in which case YouTube files it as a Short on its own. A landscape video set to Short is placed on a vertical canvas first.

Can I post a 5-minute vertical video as a Short?

No. YouTube only files videos of three minutes or under as Shorts. A longer vertical video uploads full-frame as a regular video.

Can I add the video to a playlist?

Yes. Pick an existing playlist on the YouTube tab, or type a new title and ReelMint creates it on the channel. A playlist that fails to update never fails the upload; the video is already live.

How many YouTube Shorts can I upload a day?

YouTube decides, per channel, over a rolling 24 hours, and does not publish the figure. When the limit is hit, ReelMint pauses that destination for 24 hours and tells you.