I've found I get better results from custom GPTs and Assistants when the knowledge files are in .txt format (versus PDF).

If you're using Mac, here's a super simple folder action workflow you can build using the Automator app that will extract the text from any PDF and save it as a .txt to your desktop.

dad. exec director @ SkillsEngine. product. design. art. code. entrepreneurship.

interests: philosophy, econ, ai, systems, cybernetics

You can also turn it into a service so it will be in your right click menu