Early software has bugs. Useful reports make it less early.

What to include

1. What happened?
2. What did you expect?
3. Which step appeared to fail?
4. Approximate time and workflow ID.
5. Browser and device.
6. A screenshot with private content obscured, if useful.

For a wrong split or filename

Describe the boundary or naming decision in general terms first. We may be able to diagnose the logic without receiving the original PDF.