Hope you are doing well and thanks for reaching out.
Could you please share the specific steps or workflow you've been following to share the PDF file? If possible, a short video recording of the process would be incredibly helpful for us to gain a clearer understanding of the issue.
If you could also try sharing a different PDF file and let us know if the problem persists, that would be great.
Feel free to take your time, and don't hesitate to reach out if you have any questions or need further assistance.