> ## Documentation Index
> Fetch the complete documentation index at: https://docutrack-docs.icpitalia.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Download a Document

> Inter-Canister Flows

```mermaid theme={null}
sequenceDiagram
    actor A as Alice
    participant UC as Alice's User Canister
    A->>UC: download_file (id, 0)
    UC->>A: Return (chunk[0], num_chunks)
    A->>A: Read num_chunks
    A->>UC: download_file(id, 1..n)
    UC->>A: Return chunk 1..n

```

If Alice has access to a shared file owned by Bob, she can download it in the same way:

```mermaid theme={null}
sequenceDiagram
    actor A as Alice
    participant UC as Bob's User Canister
    A->>UC: download_file (id, 0)
    UC->>UC: Check if Alice has access
    UC->>A: Return (chunk[0], num_chunks)
    A->>A: Read num_chunks
    A->>UC: download_file(id, 1..n)
    UC->>A: Return chunk 1..n

```