Something worth checking in this situation is the output text generated if you do the curl command:
`curl --user rokudev:$ROKU_USERPASS --digest --silent --show-error --output out.txt \ -F "passwd=$ROKU_PACKPASS" -F "mysubmit=Package" -F "app_name=MyApp" -F "pkg_time=$TIME" \ http://$ROKU_HOST/plugin_package`
If it says the zip couldn't be found, that may mean that the zip couldn't compile. If you use the Brightscript Extension for VS Code that may also give you some more helpful logs in the output when you try to compile it.