Turn on the Availability filter in Shopify's Search & Discovery app; Smootify counts the products of a collection from it.
The symptom. Previous and next work, but the numbered pages of a collection never show.
Why. Shopify’s API gives a collection no total number of products. Smootify works it out from the Availability filter.
The fix. In Shopify’s Search & Discovery app, turn on the Availability filter. The numbers then show on collections. A search counts at most 1,000 results, Shopify’s limit.