Welcome, @Highlander_Yeti!
A few more details would help to troubleshoot:
- Which tutorial are you following (share the link please)?
- Have any other jobs been successful so far in your local Docker Galaxy (besides Upload)?
- What is the full error message? You might find this after clicking on the
bug icon. Or, you might need to look under the 
job details icon and click on stderrandstdout.
Thanks!