Hi @Joseph Thiel,
Plugins steps should be added to the solution to be able to transfer them in other instances. Do you have them in section "Sdk Message Processing Steps" of your solution?
So yes this should definitively resolve your problem!
And don't worry, I think that forgetting SDK message processing steps in the solution is a mistake that every one working with plugins in solutions has made at least once!
For your information, Images are automatically added with steps. So don't have to bother about that.
If you are new to D365, and want to learn good pratices to improve your Application Lifecycle Managment. I made a webinar last week about this subject :
If you've found this thread useful, dive deeper into User Group community content by role