Recognize what makes this moment difficult
Acknowledge the event directly without turning it into a lesson, comparison, prediction, or silver lining. For a message about how to follow up on a content review, use this factual base: summarize the deliverable, version, requested input, owner, and effect on the schedule.
Offer support that can be accepted
Offer one specific form of practical or emotional support and make clear that no immediate reply is needed. Give a small set of options and explain which default plan applies if the real deadline passes. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Follow their pace rather than yours
Do not bury a scope or price change, threaten the relationship, or pretend silence means approval. Use the contract and documented escalation route for legal, payment, privacy, or security decisions. The recipient decides whether they want conversation, ordinary company, practical help, professional support, or quiet.