Rechnung: <br>
<form action="rechnung/upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="datei" value="test"><br>
<input type="submit" value="Hochladen">
</form>

Rechnung intern: <br>
<form action="rechnung_falk/upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="datei" value="test"><br>
<input type="submit" value="Hochladen">
</form>

DHL: <br>
<form action="dhl/upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="datei" value="test"><br>
<input type="submit" value="Hochladen">
</form>