recommended
You really should use relative urls. That way they'll work better for private repos as well.

supposing your repo has latest.png inside the screenshots folder.
~B
or right click on image from github and open image in new tab and copy url from there and past in Readme.md
e.g

<!-- the common way | no image resizing -->

<!-- the uncommon way | image resizing -->
<img src="https://your-image-url.type" width="100" height="100">
# 

# You can now drag and drop the images while editing the readme file.
# Github will create a link for you which will be in the format of:
https://user-images.githubusercontent.com/******/********.file_format
You can also use relative paths like

Also try the following with the desired .fileExtention:

conver video to gif
https://convertio.co/
crop gif
https://ezgif.com/crop
upload gif online web
https://imgbb.com/
paste link
<img src="url_images" alt="drawing" width="400"/>
or

Try this markdown:

I think you can link directly to the raw version of an image if it's stored in your repository. i.e.
