The Invite a Collaborate feature in instagram is compatible with Stampede Social as long as account initiating the collaboration is connected with Stampede Social. The mirrored version will work 100% of the time on the collaborators timeline since it is merely a mirror of the authorized Stampede Social poster's post.
Instagram does not make that feature available via 3rd party apps - only via the actual Instagram app.
No. Stampede Social will only ever send the automated DM from the original poster of the post which must also be authenticated with Stampede Social.
Stampede Social cannot send DMs on anyone's behalf that is not authenticated with Stampede Social.
Yes. For a post that you plan to Invite a collaborator only use wording that encourages your fans to make direct comments to the post.
Do not mention DMing the hashtag direct via DM because that feature will not work with the Invited collaborator and will likely cause confusion with your fans.
example:
Comment #party below to get an exclusive link sent right to your DM.
While you can Invite anyone as a collaborator a post will only ever show on their timeline if they accept your request to be a collaborator.
No (but, we'd love you to put in a good word).
But seriously, no they do not. Since the post is a mirror of the post from an account that is authenticated with Stampede Social only that account needs a Stampede Social account.