I usually adapt the content I share to the platform I'll share it in. So when I share on LinkedIn, I write 1-2 sentences and share the link as a post, and on some groups, I've been a member for some time. On Instagram, I would make some slides thanks to Canvas, as you point out, and deliver the key points as a slideshow. And so on.

It helps having it tailored that way, but it can take a lot of time sometimes.