Action Details
Requirements and how-to articles for Facebook's action:

Post a video(s) on your Facebook page.

Requirements
You need this to get it done:

Video(s)
Video(s) to be posted (most file formats supported.)
Caption (optional)
You can add a text caption to accompany your photo(s) if you wish.
Tag Products (optional)
If you have a Facebook shop or catalogue, you can tag products in your videos
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

0
Facebook Business Help - Tag products from your Facebook Page
How to tag products from your Facebook shop or catalogue in your photos and videos.
Official
Link missing here or found errors? Improve How-Tos