Hello @PSW.Lynn ,
With the Canva integration, you can both create new images, as well as import images you've already created through the Folders tab in the integration.
Regarding Facebook, their API only allows 3rd party access like ours for business pages, so groups, event pages, personal pages, etc. cannot be used for things like Social Posts and Social Share. You can link to groups through the social buttons in emails, since those just require a URL and don't actually need any API permissions established.