<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=389945) </details> <!--IssueSummary end--> The following discussion from !110031 should be addressed: - [ ] @cablett started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/110031#note_1258626713): (+1 comment) > I know this is based on existing code but it seems this error isn't very useful. It'd be nice to add an action item (e.g. "Separator is invalid - please ensure `,`, `;`, or `tab`.") > > However, this is definitely a question for the team (~"Importer:CSV Issues" ?) whose PM is responsible for this, so no action needed just now :thumbsup: