Attaching files to incoming webhook

Hello,

I’m using incoming webhooks to post content in channels as a bot per this documentation:
https://docs.mattermost.com/developer/webhooks-incoming.html#simple-incoming-webhook

Is it possible to attach full-blown files to bot posts? The documentation mentions that it supports multi-part requests but doesn’t provide any examples. Has anyone tried this?

Thank you,

Chris

Could this doc help https://developers.mattermost.com/integrate/incoming-webhooks/?