ERROR 1109: Specified URL is invalid using cURL command to API

usually to display the result of the Run method you can use a label

probably the file paths are not correct…
are you test using the companion app?
where are the images stored? in the assets? in the ASD - application specific directory?
probably the extension is not able to access the images like this?
it might help to use one of the extensions, which provide the path to the ASD easier, which also works for the companion app…

  1. App Inventor Extensions: File | Pura Vida Apps or
  2. FileTools Extension by vknow360 or
  3. Get the path of → ASD (app-specific dir) & → private data dir (internal storage)

in a first step are you able to simplify the example a little bit for example to only get A) running?

Taifun