Creating a forum thread with an image attached

[honzajavorek]

I'm trying to create a forum thread with an image, similar to what I'd get by uploading an image using the clickable area in the top right:

My code uses something along the lines of:

from discord import File
channel.create_thread('title', 'description', file=File(path))

But the API sends me 400:

400 Bad Request (error code: 50008): Cannot send messages in a non-text channel

If I remove the file keyword argument, the thread gets created. I tried files with a single-item list, but the result is the same. What is the preferred way to upload an image with the first forum message?

What confuses me is that the initial forum thread message does support embeds. I can add embeds and buttons just fine. But if I wanted to have an embed with a thumbnail, I'd need to have file to get it work:

from discord import File, Embed
embed = Embed(...)
embed.set_thumbnail(url=f"attachment://{path.name}")
channel.create_thread('title', 'description', file=File(path))

But this doesn't seem to be possible then? Because as soon as I put anything into the file keyword argument, it gets rejected by the API. Anyone has any ideas? Since pycord has the keyword argument available when creating a forum thread, but it doesn't work with the API, is it a bug in pycord?

[honzajavorek]

Okay, so right after posting this, I continued working on workarounds. I managed to get the image uploaded using this convoluted approach:

thread = await channel.create_thread(...)
message = await thread.fetch_message(thread.id)
await message.edit(file=File(path))

I tried thread.starting_message, but that returns None, as it seems to only work with cached data. I still think this is strange and probably should be possible using a single await. I consider this to be a workaround, not valid answer to my problem, so I won't be marking this comment as an answer.

[NeloBlivion]

This should have been an issue, so I investigated and created one #1949
As for your workaround, you don't need to fetch the message, just use a partial:

message = thread.get_partial_message(thread.id)

[honzajavorek]

Awesome, thanks!