How to upload an image using fileUploader in Magento 2

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The names are really confusing.

Hi, do you have a tutorial with multiple images uploader? :) or how to modify this one, to be able to upload multiple images and show them in admin panel.

Hi, good job. any idea about video upload instead of image with preview image in add/edit both mode ? how to call third party contooler or API or class or library to admin ?

I'm Using magento 2.2.7 ver In That, I am getting following error


A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later.