Are you uploading PDFs that already have a text layer?
I don't currently subscribe to Gemini but on A.I. Studio's free offering when I upload a non OCR PDF of around 20 pages the software environment's OCR feeds it to the model with greater accuracy than I've seen from any other source.
I’m not uploading PDFs at all. I’m talking about PDFs it finds while searching than it extracts data from for the conversation.