The primary concern is performance and preventing strain on the application. Synchronously uploading and processing a 1GB file from a user-facing form is highly resource-intensive. It consumes significant server memory and can lead to long wait times or session timeouts, resulting in a poor user experience. The most performant solution is to implement an asynchronous pattern. By staging the uploaded file and using a separate, scheduled process (e.g., an overnight batch) to call the integration, the heavy processing is decoupled from the user's immediate interaction. This approach maintains application responsiveness and stability, which directly addresses the question's core concern.

B. This option ignores the severe performance impact and system strain that a large, synchronous file upload causes, even if the components are technically capable of handling the size.

C. Proposing manual workarounds is a non-technical solution. A better approach is to offer a robust, automated, and performant design pattern like asynchronous processing, which meets the business requirement.

1. Appian Documentation

System Administration Section

Configuring File Upload: The documentation notes

"Large file uploads can consume a large amount of memory. We recommend testing the memory consumption of large file uploads in a development or test environment before allowing them in a production environment." This supports the premise that large uploads strain the application.

2. Appian Documentation

Process Model Best Practices

Keep Process Flows Short: This section advises against long-running synchronous processes initiated from user interfaces. It states

"If a process is started from a record view or a Tempo report

it should complete as quickly as possible... For longer processes

consider completing the first few steps in a synchronous subprocess and then completing the rest of the process asynchronously." This directly supports the asynchronous pattern proposed in option A.

3. Appian Documentation

Process Modeling

Asynchronous Subprocesses: This page details the use of asynchronous subprocesses to "allow the parent process to continue execution without waiting for the subprocess to complete." This is the fundamental mechanism for implementing the performant design described in option A

offloading long-running tasks to prevent blocking the user-facing process.