[galaxy-dev] Execution of workflows using API

Hello, I have a question regarding execution of workflows using API (workflow_execute.py). I am writing a script to automate file uploading and workflow execution using API. I was able to upload files and the response gave me ids for each file with 32 characters although the README example returned 16 characters. (I used library_upload_from_import_dir.py) Then I tried to execute a workflow using workflow_execute.py but it does not seem that the script accepts the ids. Is there any ways to resolve this issue? Thank you, Taka