Styles take some getting use to. Basically, you have a set of libraries that Inventor uses. The libraries are set up your CAD manager or you if its just you. (it also comes with a standard setup).
You need to work on the basis that every document (part, assembly, drawing) will get the required library objects and store / copy them locally in the document.
The reason you are getting the message is because the library in the document and the master style library are different. This is usually caused by 2 factors:
- The master style library has been updated and your document is out of date
- Your document has been updated and your master library is out of date.
To be clear, you document should always match the master style library.
go to the manage tab

by clicking update, you are getting the latest objects FROM the master library to the document.

by clicking save, you are SAVING any changes to the styles from the document to the master library.

by clicking Styles Editor, you are opening the styles editor to make changes. Any change here will affect all documents using that style.
If you make any changes, you should always open the templates, update them then save them to make sure all future documents are using the latest styles. Any existing documents should be updated and saved by clicking the update button as shown above.
HTH
Nacho
Nacho
Automation & Design Engineer
Inventor automation Programmer (C#, VB.Net / iLogic)
Furniture, Sheet Metal, Structural, Metal fab, Tradeshow, Fabrication, CNC

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