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Here is a general process for using the Volley library to upload a file on Android:

1. Create a request queue using Volley.newRequestQueue() method.
2. Declare a StringRequest object and set the URL of the server where the file needs to be uploaded using the setURL() method.
3. Set the method of the request to POST using the setMethod() method.
4. Declare a new File object using the file path of the file to be uploaded.
5. Declare a new MultipartEntityBuilder object and append the File object using the addPart() method.
6. Set the entity of the StringRequest object to the MultipartEntityBuilder object using the setEntity() method.
7. Add the StringRequest object to the request queue using the add() method.

Here is some sample code that demonstrates this process:

``` RequestQueue requestQueue = Volley.newRequestQueue(this);

StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<string>() { @Override public void onResponse(String response) { Log.d(TAG, "Response: " + response); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e(TAG, "Error: " + error.getMessage()); } }) { @Override public String getBodyContentType() { return "multipart/form-data; boundary=" + BOUNDARY; }

@Override
public byte[] getBody() throws AuthFailureError {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    try {
        MultipartEntityBuilder builder = MultipartEntityBuilder.create()
                .setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

        File file = new File(filePath);
        builder.addPart("file", new FileBody(file, ContentType.APPLICATION_OCTET_STREAM, file.getName()));
        builder.addTextBody("filename", file.getName());

        HttpEntity entity = builder.build();
        entity.writeTo(bos);
    } catch (Exception e) {
        Log.e(TAG, "MultipartEntityBuilder error: " + e.getMessage());
    }
    return bos.toByteArray();
}

};

requestQueue.add(stringRequest);