`filesUploadV2` needs `thread_ts`

[matthewnessworthy]

In the original filesUpload method there was the option to send through thread_ts. Ideally this would be possible with filesUploadV2 too.

[damienalexandre]

We have it in our patched schema:

https://github.com/jolicode/slack-php-api/blob/59e617a0176f5d9579dc0ee935c8aeaa0e74c31c/resources/slack-openapi-patched.json#L16886

As well as in the endpoint:

slack-php-api/generated/Endpoint/FilesCompleteUploadExternal.php

Line 30 in 59e617a

* @var string $thread_ts Provide another message's `ts` value to upload this file as a reply. Never use a reply's `ts` value; use its parent instead. Also, make sure to provide only one channel when using `thread_ts`.

So I assume it's just about making all the options available in this method:

slack-php-api/src/Client.php

Lines 159 to 167 in 59e617a

	return $this->filesCompleteUploadExternal(
	array_filter(
	[
	'files' => json_encode($filesPayload, \JSON_THROW_ON_ERROR),
	'channel_id' => $channelId,
	'initial_comment' => $initialComment,
	]
	)
	);

Would you be able to submit a PR for this?

[matthewnessworthy]

I can, but the current method signature is quite different to all the other slack methods, so it would end up being a breaking change to do it right