Method: messages.uploadMedia

Upload a file and associate it to a chat (without actually sending it to the chat)

Parameters:

Name	Type	Description	Required
business_connection_id	string		Optional
peer	Username, chat ID, Update, Message or InputPeer	The chat, can be inputPeerEmpty for bots and inputPeerSelf for users.	Optional
media	MessageMedia, Update, Message or InputMedia	File uploaded in chunks as described in files »	Optional

Return type: MessageMedia

Can bots use this method: YES

MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$MessageMedia = $MadelineProto->messages->uploadMedia(business_connection_id: 'string', peer: $InputPeer, media: $InputMedia, );