To create YouTube shorts:

Select your YouTube account:

After that you can upload you video (I choose Upload from external URL):

Make sure to choose a vertical video that fits the shorts format.

Once the video is uploaded to Publer you can create your content accordingly.
Make sure to use #shorts hashtag on the description, otherwise it will be posted as a normal video.

Always make sure to put the hashtag in the description, in order for the video to be shared as a YouTube short.

Next step is optional, previewing the video:

Lastly you can schedule it or post it directly:

When posted YouTube will take a couple of minutes to verify it and then you can view it:

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