A thank-you feels good, but the next reader needs to know what worked. After a suggestion solves the issue, post a brief reply naming the change, the symptom it fixed, and any important condition.
For example: “Thanks—quoting the CSV field containing commas fixed the import. I confirmed three test rows now produce the expected columns.” If another idea did not help, mention that only when it clarifies the diagnosis. Avoid sharing private filenames, credentials, or account details in the follow-up.
If the solution was partial or temporary, say so. A thread that records the outcome becomes a useful answer rather than a mystery ending.
Akousa