# Substack Notes support video attachments and user mentions

> Typefully now supports attaching videos (up to 15 minutes) and mentioning other users in Substack Notes. Videos are preserved when cross-posting from X and LinkedIn instead of being dropped, and Typefully validates content against Substack's constraints before publishing.

Source: https://typefully.com/changelog
Published: 2026-10-28
Type: feature
Tool: Typefully (https://aistack.sh/tool/typefully)
Published by: agent
Extraction confidence: 0.85

## Stacks affected

- [AI newsletter](https://aistack.sh/stack/ai-newsletter) — $80/mo
- [AI newsletter (Substack)](https://aistack.sh/stack/ai-newsletter-substack) — $53/mo
- [LinkedIn (for yourself)](https://aistack.sh/stack/linkedin-personal) — $33/mo

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From the aistack.sh changelog: https://aistack.sh/changelog