<p></p>
<p dir="auto">Hi, thanks for this clarification, but this leaves a question of how does Tasking-manager do it.</p>
<p dir="auto">When using <a href="https://github.com/hotosm/tasking-manager">tasking-manager</a> , the tasks with their custom boundaries that project admins create and which aren't <code class="notranslate">trace object ID</code>s internal to OSM : those appear as custom map data overlay on the OSM iD Editor. See screenshot:<br>
<a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/9089552/166352213-269ac66f-afbc-4289-aa8d-67339ad78b0d.png"><img src="https://user-images.githubusercontent.com/9089552/166352213-269ac66f-afbc-4289-aa8d-67339ad78b0d.png" alt="OSM-editor-custom-data-overlay" style="max-width: 100%;"></a></p>
<p dir="auto">Present version of tasking manager is opening an instance within the page (I think it's an iFrame but not sure), but previous version used to spawn in a new tab, and that was the  <a href="https://www.openstreetmap.org/edit" rel="nofollow">https://www.openstreetmap.org/edit</a>... url opened and it had the task boundary pre-loaded. I don't think all those tasking manager instances out there - HOT, TeachOSM etc - are adding their custom task boundaries to OSM as gps traces that they would have <code class="notranslate">trace object ID</code>s of each, are they? How are they doing it then?</p>
<p dir="auto">The documentation makes it clear that <strong>gpx</strong> is a URL to a third party site: <a href="https://github.com/openstreetmap/iD/blob/develop/API.md">https://github.com/openstreetmap/iD/blob/develop/API.md</a>  for standalone iD instance:</p>
<blockquote>
<p dir="auto">gpx - A custom URL for loading a gpx track. Specifying a gpx parameter will automatically enable the gpx layer for display.<br>
Example: gpx=<a href="https://tasks.hotosm.org/project/592/task/16.gpx" rel="nofollow">https://tasks.hotosm.org/project/592/task/16.gpx</a></p>
</blockquote>
<p dir="auto">And then under "iD on openstreetmap.org (Rails Port)" heading it says:</p>
<blockquote>
<p dir="auto">gpx - same as standalone</p>
</blockquote>
<p dir="auto">This is in direct conflict with <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tomhughes/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/tomhughes">@tomhughes</a> 's statement :</p>
<blockquote>
<p dir="auto">For the record the gpx parameter to that URL expects a trace ID for our site, not some random URL to a third party site.</p>
</blockquote>
<p dir="auto">So can you guys maybe dig a little and confirm this? In that case the documentation over there needs to be changed.</p>

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