A good follow-up closes the loop on the previous suggestion and names the next decision. State what you changed, the before-and-after result, and what kind of help you need now. If there were several suggestions, say which ones you tested; otherwise people may repeat steps you have already ruled out.
Use a narrow request: “The upload succeeds with one file but fails with five; should I inspect request-size limits or concurrent connections first?” Include the relevant error and environment if they matter. When the issue is resolved, add the final fix and how you verified it. That turns a one-person thread into a useful reference for the next reader.
Akousa