Multi Image Upload with PHP, Ajax and vanilla Javascript

Hello Developer, i need a Multi Image Upload for a classifieds website. Here are the requirements about this project in short language: // Filestructure - [login to view URL] - [login to view URL] - images/$item_id/...$images... // DB Structure -- items_images image_id | item_id | path | name | ext | ordering | date_created Conditions ---> - create 2 images from original -> " small " and " big " -> delete the original ( if possible, do not upload at all ) - add watermark on bottom right (image in png) - let user sort, rotate, delete it and let him set a main image ( order_pos 1 ). - images are generated at "form-send" action ( item new or item edit page ). - Only pure PHP, vanilla Javascript, Ajax - No dependencies to other Frameworks/Stylesheets/JQuery - Must fit to all mayor Browsers -> Chrome , Safari , Edge , Firefox , Samsung , Opera - User interactions - Move l/r , Rotate l/r , delete , set as Main image --- if possible make the "movement" of an image "draggable" to the user. // Settings for images $minFiles = 1 ; $maxFiles = 20 ; $maxSize = 5 ; // mb $fileTypes = [ "image/jpeg", "image/png"] ; // protect from other formats $rotation = 90 ; // degree on one click // set only the height or the width ( calc it ) ---> don`t crop it. $imgSmallW = 240 ; // px $imgSmallH = 150 ; // px $imgBigW = 1000 ; // px $imgBigH = 600 ; // px $watermark = url("/images/system/[login to view URL]") ; // add it on generate image to the bottom right corner $watermark_w = 60 ; // px $watermark_h = 30 ; // px $imgQuality = 0.8 ; $order_pos = get_pos_id ; // generate pos_id from selected sequence from user ( e.g. left to right -> 1 - 20 ) // save form procedure for [login to view URL] $image_id = AUTO_INCREMENT; // will set from DB $item_id = $_POST['id']; // is generated from website when the form is succsessfully send... $path = "images/" . $item_id . "/"; $name = "eto-" . $item_id . "-" . $image_id; $ext = "jpg or png"; $ordering = $order_pos; // get form with [login to view URL] $item_id = $_GET['id']; // the id is instantly accessible when opens, please preload all images from the item I am eagerly awaiting your offers.