Attachment slash command input should bypass "Attach Files" permission.

[NeloBlivion]

The attachment slash input has been great thus far, but I've ran into a problem; if a user doesn't have the Attach Files permission in the channel they can't upload to the command, thus rendering it unusable if the attachment is a required argument.

While this makes sense at first glance, this behaviour is odd to me; the user isn't uploading directly to the channel, they're uploading the attachment for the bot to work with. And if the command is ephemeral, there's even its own ephemeral-attachments route it's uploaded to instead of the guild ID. Being able to upload a file to a command regardless of permission makes sense to me considering it has a very explicit usage.

I currently work around this by having two optional arguments, one that takes an attachment and another that takes a standard image URL, but this is far from ideal. Thoughts?

Permission comparison with / without Attach Files