did you upload an xml file to GD (let's say it's testform.xml) and media files in that case (testform-media dir with all media files)? and both are in the same place on your GD?
Thanks a ton for your help @Grzesiek2010 . My issue was that I was copying all the media files directly in the same GD as the xml file and not in a folder named testform-media. After fixing this, it works beautifully.
Gracias estaba teniendo el mismo problema, nombraba al directorio-media igual que el directorio donde estaba mi formulario encuesta-test1.xml (/test-form1) y me daba error.
Al nombrar mi directorio-media igual al formulario (encuesta-test1.xml) ya pude visualizar mis imágenes en odk collect