Wojciech Trocki this issue is related to the configuration of server app in OpenShift. In our demo project, I set up the volume that mounts the files folder (see volumes section. This caused the file inside the files folder to disappear. The reason why I set up the volume on OpenShift was to keep the uploaded files for the case our demo server container would crash or be redeployed (otherwise we would lose the data).

I just set up another project with the same ionic-showcase server image, but without the mount volume and the file is still there. So the question is if we should really consider this as a bug.