The signed version of the support letter, executed contract schedules, cover correspondence sent with a filing, and the credential documents actually attached. Applicants frequently hold drafts of these and never see the final versions that went out.
Chase the finals, not the drafts
Ask specifically for the executed and submitted versions, with signature pages and any exhibits or schedules. Where a filing was made, ask for the complete package as sent, including forms and receipts. If counsel or the employer holds items they will not release in full, ask what can be shared and record what is being withheld, so the gap is known rather than assumed away.
Where a signed agreement, a supporting letter, and an internal description differ, the discrepancy invites questions that a consistent file avoids. The letter should name the employer, the profession being claimed, the duties, the qualification held, the salary and the intended period. The employer's letter, proof of citizenship, the credential the Appendix 2 entry names with any translation, and evidence of the employment terms. The degree and transcripts show the qualification; if the degree is from outside the three USMCA countries, a credential evaluation from a recognized service is required.