Start with the offer and employer letter describing the actual professional duties, compensation and intended duration. Where needed to understand the arrangement, identify the legal entity and explain the reporting structure or specific assignment. The applicant still needs the relevant citizenship and qualification evidence.
Choose supporting material that answers a question
A concise organizational explanation may resolve confusion about who supervises the role; a relevant project description may clarify the work. These are suggested explanatory tools, not universally required attachments. Ask whether every extra item adds a verifiable fact.
Reconcile trade names with the legal employer name and ensure the signatory can speak for the organization. Avoid using a glossy website or generic business plan as a substitute for an actual offer of qualifying professional employment. Choose material that answers a question rather than material that fills a file.
For a new position, the useful documents are those explaining why it exists and what it involves: the business circumstance that created the need, the internal note or discussion in which the role was proposed, the duty description as the owner would give it, and any record of the work currently being done by someone else or left undone. Add the company's own particulars — its formation, what it does, its other staff if any, and who would supervise. On the applicant's side, the credential evidence stands separately and should not be mixed with the employer's material.
Where a document does not answer an identifiable question, leave it out; a small employer's file is more persuasive when it is short and pointed than when it is padded.