A quick way is to copy and paste pics in. That does not work from some websites though. Don't know why.
So for those, and for my own pics, I copy to a directory on my PC, and "upload a file" from there.
if you provide a link to a hosting service
- some people can't view them if not subscribers or with high security settings
- some people don't like to open third-party sites
- some people don't like the floods of ads
- sometimes the link is a trick