Is there any documentation explaining how the "knowledge" adopted and used in GPTs?

Im in with GPTs developing. I am tring to understand what is the best practise to upload/structure the “knowledge” for the best performance/speed of my own GPT.
But I really did not find detailed information regarding how is GPTs using the uploaded knowledge.
for example, I have around 10k rows of structured product information with many attribues data, what is the best way of uploading: sqlites, csv or human plain text?
Thanks in advance. If you have any links with bit detailed and fundemental doc would be very helpful!

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