Upload Thumbnail using wp_handle_upload

Hi, Im using:

– Custom Upload Dir
– Resize at Upload Plus

How to re-size the original thumbnail downloaded from Youtube or whatever video website, and save it in the appropriate folder, according to the settings defined in these plugins ?

I think there is a code change using wp_upload_bits together with wp_handle_upload

https://www.ads-software.com/plugins/video-thumbnails/