This will skip videos for uploading to s3 bucket

prevent-video.php

<?php
/**
 * rtamazon_can_upload_to_bucket  Prevent preticular media type to upload to s3 bucket
 * @param  bool $status        	  status of filter
 * @param  int  $attachment_id    Id of uploading media
 * @return bool                	  Return false if media type is video
 */
function rtamazon_can_upload_to_bucket( $status, $attachment_id ) {

	// Get the mime type for uploading video.
	$mime_type = get_post_mime_type( $attachment_id );
	$type_arr = explode( '/' , $mime_type );

	// Get media type.
	$type = $type_arr[0];
	
	// Check if it is video type, then skip uploading to bucket.
	// Other types you can define i.e 'image', 'audio' etc.
	if ( ! empty( $type ) && 'video' === $type ) {
		$status = false;
	}
	return $status;

}
add_filter( 'rtawss3_can_upload_to_bucket', 'rtamazon_can_upload_to_bucket', 99, 2 );