Testing your Alias or Redirect plugin

Set your Image URL, e.g. https://my-blog.com/img.png or http://192.168.0.1/img.png

Navigate to Playlists, then find or add the Alias instance you just created via the Add a Plugin dropdown

Drag and drop the Alias instance to be directly below whatever item is now being shown, indicated by a green badge with "Displayed now"
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Click the button on the back of your TRMNL device to force-skip to the next item, your Alias instance

If you see your image, great. If you just see the TRMNL logo, your image formatting may not be exactly to spec. See here.

Set your JSON endpoint Web Address, noting that this must be publicly accessible on the web. A 192.168 style address won't work because our web server needs to GET this endpoint and share its response parameters to your physical device. The response's url parameter can* be a local network destination however.

Navigate to Playlists, then find or add the Redirect instance you just created via the Add a Plugin dropdown

Drag and drop the Redirect instance to be directly below whatever item is now being shown, indicated by a green badge with "Displayed now"
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Click the button on the back of your TRMNL device to force-skip to the next item, your Redirect instance

If you see your image, great. If you just see the TRMNL logo, your JSON response body or image formatting may not be exactly to spec.

Create a Private Plugin and input your Redirect instance's Web Address into the Polling URL field. Click Save, then click "Force Refresh" on the right side.

Open the Markup Editor and click to expand the Your Variables accordion.

Check if your 3x parameters are present. If not, double check that your JSON content is returned with header content-type set to application/json . TRMNL does not explicitly request a content-type.