question

Hi @MichelleUnser-0403 ,
1. Only Office files force users save such properties (other files require online properties edition+CheckIn, what is a very boring work).
2. When One download these files from sharepoint and share by e-mail, USB drives, etc, these files don't keep such properties.
3. You could change the filename to keep these files such properties.

A similar post for your reference:
https://social.technet.microsoft.com/Forums/en-US/5c445010-152a-4fd0-a4f9-b71f2a2476e3/how-to-give-naming-convention-for-a-document-library?forum=sharepointgeneralprevious

Here is a nice article about naming convention
https://www.spguides.com/sharepoint-naming-conventions/

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