Collaborate on a post with another user

We need a collab post with photographer Alex to credit him and share reach. Create the post with the image from the shoot, tag Alex as a collaborator so it publishes to both profiles, use the approved caption about licensing and the shoot date, and ask Alex to confirm his account is eligible for collaborator posts. Post it on Tuesday at 09:00 and verify it appears on both our feeds.

Before I send this to Alex in collaborations, make it easy for him to approve: show the draft post as it will appear on both feeds, surface the caption's licensing line at the top, call out any uses of music that could block cross-posting, and flag language that implies exclusivity. Offer one simpler caption he can accept with one click.

I invited photographer Alex to be the collaborator on a post with a portrait from last week's shoot; he says he hasn't seen the invite. Procurement for the model release is complete, but I'm worried that if Alex declines the collaboration late we'll lose the co-post reach and annoy the model. What is the most likely reason he hasn't accepted and what should I do next to salvage the post timing?

Over six shoots our plan to boost reach with collaborator posts keeps breaking: collaborators miss invites, accounts aren't eligible, or captions change last minute. I handle creative ops and it's draining approval time. Which habit change — standardized captions, a single collaborator checklist, or scheduling buffer days — will prevent most failures and restore reliable co-posting?