diff --git a/CHANGELOG.md b/CHANGELOG.md
index c8fbd366a..fbf1a3047 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ Fixes:
 - Improved the `markdownEscape` function!
 - Translated even more MadelineProto UI elements!
 - Now the same static analysis rules are applied for both plugins and simple event handlers.
+- Made some fixes to simple filters.
 
 ---
 
diff --git a/README.md b/README.md
index 043f1e812..6f2e47a5c 100644
--- a/README.md
+++ b/README.md
@@ -495,7 +495,7 @@ Want to add your own open-source project to this list? [Click here!](https://doc
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getdhconfig-array" name="getDhConfig">Get diffie-hellman configuration: getDhConfig</a>
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getdownloadinfo-mixed-messagemedia-array-ext-string-name-string-mime-string-size-int-inputfilelocation-array" name="getDownloadInfo">Get download info of file: getDownloadInfo</a>
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getpropicinfo-mixed-data-array" name="getPropicInfo">Get download info of the propic of a user: getPropicInfo</a>
-    * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getdownloadlink-danog-madelineproto-eventhandler-message-array-string-media-string-scripturl-null-string" name="getDownloadLink">Get download link of media file: getDownloadLink</a>
+    * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getdownloadlink-danog-madelineproto-eventhandler-message-danog-madelineproto-eventhandler-media-array-string-media-string-scripturl-null-string" name="getDownloadLink">Get download link of media file: getDownloadLink</a>
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#geteventhandler-class-string-plugineventhandler-class-null-danog-madelineproto-eventhandler-danog-madelineproto-ipc-eventhandlerproxy-__php_incomplete_class-null" name="getEventHandler">Get event handler (or plugin instance): getEventHandler</a>
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getextensionfromlocation-mixed-location-string-default-string" name="getExtensionFromLocation">Get extension from file location: getExtensionFromLocation</a>
     * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#getextensionfrommime-string-mime-string" name="getExtensionFromMime">Get extension from mime type: getExtensionFromMime</a>
@@ -617,6 +617,7 @@ Want to add your own open-source project to this list? [Click here!](https://doc
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/account.installTheme.html" name="account.installTheme">Install a theme: account.installTheme</a>
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/account.saveWallPaper.html" name="account.saveWallPaper">Install/uninstall wallpaper: account.saveWallPaper</a>
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/photos.updateProfilePhoto.html" name="photos.updateProfilePhoto">Installs a previously uploaded photo as a profile photo: photos.updateProfilePhoto</a>
+    * <a href="https://docs.madelineproto.xyz/PHP/danog/MadelineProto/API.html#processdownloadserverping-string-path-string-payload-void" name="processDownloadServerPing">Internal endpoint used by the download server: processDownloadServerPing</a>
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/help.editUserInfo.html" name="help.editUserInfo">Internal use: help.editUserInfo</a>
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/phone.inviteToGroupCall.html" name="phone.inviteToGroupCall">Invite a set of users to a group call: phone.inviteToGroupCall</a>
     * <a href="https://docs.madelineproto.xyz/API_docs/methods/channels.inviteToChannel.html" name="channels.inviteToChannel">Invite users to a channel/supergroup: channels.inviteToChannel</a>
diff --git a/examples/bot.php b/examples/bot.php
index a9d42def2..7818b4c48 100755
--- a/examples/bot.php
+++ b/examples/bot.php
@@ -30,7 +30,6 @@ use danog\MadelineProto\EventHandler\Filter\FilterText;
 use danog\MadelineProto\EventHandler\Message;
 use danog\MadelineProto\EventHandler\SimpleFilter\FromAdmin;
 use danog\MadelineProto\EventHandler\SimpleFilter\Incoming;
-use danog\MadelineProto\EventHandler\SimpleFilter\IsReply;
 use danog\MadelineProto\Logger;
 use danog\MadelineProto\Settings;
 use danog\MadelineProto\Settings\Database\Mysql;
@@ -184,8 +183,12 @@ class MyEventHandler extends SimpleEventHandler
      * Gets a download link for any file up to 4GB!
      */
     #[FilterCommand('dl')]
-    public function downloadLink(Incoming&Message&IsReply $message): void
+    public function downloadLink(Incoming&Message $message): void
     {
+        if (!$message->replyToMsgId) {
+            $message->reply("This command must reply to a media message!");
+            return;
+        }
         $message = $message->getReply();
         if (!$message instanceof Message || !$message->media) {
             $message->reply("This command must reply to a media message!");
diff --git a/src/InternalDoc.php b/src/InternalDoc.php
index 150715793..89d1b09a6 100644
--- a/src/InternalDoc.php
+++ b/src/InternalDoc.php
@@ -1355,6 +1355,13 @@ abstract class InternalDoc
     {
         return \danog\MadelineProto\Tools::posmod($a, $b);
     }
+    /**
+     * Internal endpoint used by the download server.
+     */
+    public function processDownloadServerPing(string $path, string $payload): void
+    {
+        $this->wrapper->getAPI()->processDownloadServerPing($path, $payload);
+    }
     /**
      * Initiates QR code login.
      *
diff --git a/src/Ipc/Runner/RunnerAbstract.php b/src/Ipc/Runner/RunnerAbstract.php
index 2ce33d98c..daf8bbd83 100644
--- a/src/Ipc/Runner/RunnerAbstract.php
+++ b/src/Ipc/Runner/RunnerAbstract.php
@@ -6,9 +6,6 @@ namespace danog\MadelineProto\Ipc\Runner;
 
 use Phar;
 
-use const MADELINE_PHAR;
-use const MADELINE_PHP;
-
 /**
  * @internal
  */
diff --git a/src/MTProtoTools/FileServer.php b/src/MTProtoTools/FileServer.php
index 212174fae..026a95a8d 100644
--- a/src/MTProtoTools/FileServer.php
+++ b/src/MTProtoTools/FileServer.php
@@ -45,7 +45,8 @@ trait FileServer
     public static function downloadServer(string $session): void
     {
         if (isset($_GET['c'])) {
-            self::$checkedScripts[$_GET['c']] = $_GET['i'];
+            $API = new API($session);
+            $API->processDownloadServerPing($_GET['c'], $_GET['i']);
             die;
         }
         if (!isset($_GET['f'])) {
@@ -61,6 +62,14 @@ trait FileServer
         );
     }
 
+    /**
+     * Internal endpoint used by the download server.
+     */
+    public function processDownloadServerPing(string $path, string $payload): void
+    {
+        self::$checkedScripts[$path] = $payload;
+    }
+
     /**
      * Get download link of media file.
      */
@@ -104,17 +113,17 @@ trait FileServer
     }
 
     private static array $checkedAutoload = [];
-    private const DOWNLOAD_SCRIPT = '<?php require "%s"; \danog\MadelineProto\API::downloadServer(__DIR__);';
+    private const DOWNLOAD_SCRIPT = '<?php require %s; \danog\MadelineProto\API::downloadServer(__DIR__);';
     private function getDefaultDownloadScript(): string
     {
         if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
             throw new AssertionError("Please specify a download script URL when using getDownloadLink via CLI!");
         }
         $s = $this->getSessionName();
-        if (\defined(MADELINE_PHP)) {
-            $autoloadPath = MADELINE_PHP;
-        } elseif (\defined(MADELINE_PHAR)) {
-            $autoloadPath = MADELINE_PHAR;
+        if (\defined('MADELINE_PHP')) {
+            $autoloadPath = \MADELINE_PHP;
+        } elseif (\defined('MADELINE_PHAR')) {
+            $autoloadPath = \MADELINE_PHAR;
         } else {
             $paths = [
                 \dirname(__DIR__, 4).'/autoload.php',
@@ -139,7 +148,7 @@ trait FileServer
             return self::$checkedAutoload[$autoloadPath];
         }
         $downloadScript = \sprintf(self::DOWNLOAD_SCRIPT, \var_export($autoloadPath, true));
-        $f = $s.DIRECTORY_SEPARATOR.\hash('sha256', $autoloadPath);
+        $f = $s.DIRECTORY_SEPARATOR.'dl.php';
         $recreate = true;
         if (exists($f)) {
             $recreate = read($f) !== $downloadScript;
@@ -177,10 +186,16 @@ trait FileServer
             if (isset(self::$checkedScripts[$scriptUrl])) {
                 return;
             }
-            $i = \random_int(PHP_INT_MIN, PHP_INT_MAX);
-            $this->fileGetContents($scriptUrl.'?'.\http_build_query(['c' => $scriptUrl, 'i' => $i]));
-            if (!isset(self::$checkedScripts[$scriptUrl]) || self::$checkedScripts[$scriptUrl] !== $i) {
-                throw new AssertionError("$scriptUrl is not a valid download script!");
+            $i = (string) \random_int(PHP_INT_MIN, PHP_INT_MAX);
+            $scriptUrl = $scriptUrl.'?'.\http_build_query(['c' => $scriptUrl, 'i' => $i]);
+            $this->logger->logger("Checking $scriptUrl...");
+            $this->fileGetContents($scriptUrl);
+            if (!isset(self::$checkedScripts[$scriptUrl])) {
+                throw new AssertionError("$scriptUrl is not a valid download script, the check array wasn't populated!");
+            }
+            if (self::$checkedScripts[$scriptUrl] !== $i) {
+                $v = self::$checkedScripts[$scriptUrl];
+                throw new AssertionError("$scriptUrl is not a valid download script, the check array contains {$v} instead of $i!");
             }
         } finally {
             $lock->release();