How do I write a promo packet?
The concept of promo packet was popularized by Google. A candidate write a promo packet that will be reviewed by an independent committee. Since a person only seeks promotion every few years, they generally don't know how to write a proper promo packet. Here are a few tips about writing a promo packet.

First you need to describe your team and your role on the team, so the committee understands your context. For example, being the tech lead of Amazing Service for the past 2 years.

Second you need to describe the biggest accomplishments in recent years, typically up to 5. For example, launched Amazing Service or improved SLA from 3 9s to 4 9s.

Next you need to show your actual work closely matches the requirements of the next level. For example, designed and built the security system for Amazing Service, or hired and managed the Amazing Service team, or initiated Amazing Service and grew it to $100M ARR.

The above points are your promo rationale, which should be the focus of your packet. The rest of the packet is to provide verifiable evidence to your rationale.

A good promo packet informs the committee of your role, your accomplishments, the next level traits demonstrated in your accomplishments , plus sufficient evidence. Best luck!