I'd asked where the manual is for this (and ALL of your products, for that matter).
The response I got from Vevor was "The manual is shown in the document in the link"
What is that supposed to mean? Please simply tell me where on your website I can find manuals for your products, so that I can review their suitability BEFORE purchase, and prevent unnecessary returns.
You need to list manuals on the product pages, where they can EASILY be found - just like Harbor Freight does.