# Handling Files For Authentication
As part of the authentication options, Aikido provides the possibility to upload files and facilitate more complex authentication flows.
**Use this feature if your application requires:**
* **Predefined files:** Your application uses predefined files as part of f.e. KYC authentication flows
* **Certificates:** Your api requires signing of the API requests based on certificates
* **Code scripts:** Your api uses complex authentication mechanisms for which you can provide a python script
* **GraphQL Trusted Documents:** Your application whitelists access based on Trusted Documents
* **Other complex login flows requiring files**
{% stepper %}
{% step %}
#### Add a test user
Start the flow for adding the authentication instructions and select the document option.
{% endstep %}
{% step %}
#### Add the instructions
Add the instructions of how the agents should use the file provided in the next step
{% endstep %}
{% step %}
#### Upload the file
Upload the file in the authentication instructions.
{% endstep %}
{% step %}
#### Validate
Finally, verify that the agent can interpret your instructions:
1. Click **Save & Test**.
2. The agent will launch a session and attempt to log in using the credentials and file upload
3. If successful, you will see a confirmation that the agent authenticated and reached the post-login state.
{% endstep %}
{% endstepper %}
