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The Upload your customers step shares your existing customer list with Mention Me so those people do not get referral invites as if they were new. It sits on the launch checklist after you prepare to launch.
1

Open Upload Your Customers

On the Onboarding Hub, click Upload your customers.
The customer upload wizard showing Prepare file and column mapping

The customer upload wizard, on Prepare file, with the sample CSV mapped and ready to upload.

2

Prepare a CSV

Use a CSV with headers in the first row, under 1GB. Mention Me maps your columns in the wizard, so the names do not have to match ours.If you are on Shopify, you may also be offered a store backfill instead of a file.
3

Upload

Work through the upload flow. A successful upload with at least one imported row marks the hub step complete.
You can skip this step if you are not ready. Skipping lets you continue the checklist. You can still upload later from Settings > Uploads. The canonical upload guide, including column mapping and hashed emails, is How to Upload a CSV. Use that article for the wizard itself. This page is the onboarding context: why the hub asks for the list, and when.

See Also

How to upload a CSV

The full Uploads wizard, types and mapping.

Add voucher codes

The other launch-checklist data step.

Onboarding

Back to the hub.
Last modified on September 25, 2026