45;&gt;</span> Unsigned.size_t <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>import_inbound_group_session sess sess_key sess_key_len</code></p><p>Import an inbound group session, from a previous export.</p><p>Returns olm_error() on failure. On failure last_error will be set with an error code. The last_error will be:</p><p>* OLM_INVALID_BASE64 if the session_key is not valid base64 * OLM_BAD_SESSION_KEY if the session_key is invalid</p></dd></dl><dl><dt class="spec value" id="val-group_decr