I cannot upload variables to database - php

Question

I tried to upload video filenames and other variables to the database, but the insert statement won't work. Anyway the videofile-name and the thumbnail-filename are both uploaded to the right folders.
I've checked and there's nothing wrong with the sql statement. But why won't it work can anyone tell me?
PHP code
<?php
session_start();
if (isset($_POST['submit'])) {
$videoName = $_POST['videoName'];
$videoDesc = $_POST['description'];
$category = $_POST['category'];
$level = $_POST['level'];
$userId = $_SESSION['userId'];
$videoFile = $_FILES["videoFile"];
$videoFileName = $videoFile['name'];
$videoFileType = $videoFile['type'];
$videoFileTempName = $videoFile['tmp_name'];
$videoFileError = $videoFile['error'];
$videoFileExt = explode(".", $videoFileName);
$videoFileActualExt = strtolower(end($videoFileExt));
$videoAllowed = array("mp4", "mov", "avi");
$thumbFile = $_FILES["thumbnail"];
$thumbFileName = $thumbFile["name"];
$thumbFileType = $thumbFile["type"];
$thumbFileTempName = $thumbFile["tmp_name"];
$thumbFileError = $thumbFile["error"];
$thumbFileExt = explode(".", $thumbFileName);
$thumbFileActualExt = strtolower(end($thumbFileExt));
$thumbAllowed = array("jpg", "jpeg", "png");
if (in_array($videoFileActualExt, $videoAllowed)) {
if(in_array($thumbFileActualExt, $thumbAllowed)) {
if ($videoFileError === 0) {
if ($thumbFileError === 0) {
$videoFullName = $videoFile . "." . uniqid("", true) . "." . $videoFileActualExt;
$videoFileDestination = "../video/" . $videoFullName;
$thumbFullName = $thumbFile . "." . uniqid("", true) . "." . $thumbFileActualExt;
$thumbFileDestination = "../thumbnail/" . $thumbFullName;
include 'dbh.inc.php';
if(empty($videoName) or empty($videoDesc)) {
header("Location: ../uploadVideo.php?upload=empty");
exit();
} else {
move_uploaded_file($videoFileTempName, $videoFileDestination);
move_uploaded_file($thumbFileTempName, $thumbFileDestination);
$sql = "INSERT INTO video (filnavn, thumbnail, videoName, descript, idMusician, categoryName, idLevel) VALUES ('$videoFullName', '$thumbFullName', '$videoName', '$videoDesc', $userId, '$category', $level);";
mysqli_query($conn, $sql);
header("Location: ../uploadVideo.php?upload=success");
exit();
}
} else {
echo "You had a thumbnail error!";
exit();
}
} else {
echo "You had a video error!";
exit();
}
} else {
echo "You need to upload a proper thumbnail file type";
exit();
}
} else {
echo "You need to upload a proper video file type!";
exit();
}
} else {
}

Answer 1

You cannot insert or in this way in the if() condition, you must always use the logical operator as
if(empty($videoName) || empty($videoDesc))
Because of that your execution of code must have stopped at that point.