title: How to cosign aggregate transactions involving a multisig
body: <p>As a cosignatory, I am trying to sign an aggregate transaction where a multisig is involved. However, through the cosignatory partialAdded, I don't receive any transaction to cosign.</p>
  
  <p>Example:</p>
  
  <ol>
  <li><p><strong>Alice</strong>, <strong>Bob</strong>, and <strong>Charlie</strong> are all cosigners on a <strong>2 of 3</strong> multisig account.</p></li>
  <li><p>I am submitting an <strong>aggregate bonded transaction</strong> to remove <strong>Alice</strong>, and add <strong>David</strong>.</p></li>
  <li><p>After the <strong>lock</strong> and <strong>announce</strong>, I see messages on <code>partialAdded</code> channels for <strong>Bob</strong> and <strong>Charlie</strong>’s accounts. However, querying <strong>Bob</strong> or <strong>Charlie</strong>’s accounts through the API shows 0 partials.</p></li>
  </ol>