Thumbnail Feature Request

Thanks for awesome plugin.
This is just a feature request. I request you to help us whenever you are free.
I enable thumbnail, then fetch a drive image (which is not added to media library yet) , then add it to media library, only original image is added to media library. Thumbnail is NOT associated with that image. I guess thumbnail should be associated too.
Please provide more image sizes options like thumbnail, medium, small etc. Or provide ‘filters’ where we can pass extra image sizes.
I am looking at the code too. If i am able to achieve, i will post the code.
Thanks in advance. Great work.

https://wordpress.org/plugins/google-drive-wp-media/