A watchlist is not the transaction collection
The official moderator FAQ identifies a specific limitation: the browser My List button has no function for products that were bought or rented. That is a more precise explanation than assuming that the title has disappeared. A control can be visible under a video without serving as the place where the platform records your entitlement.
Find the transaction before altering the app
On the web, the documented route is account settings followed by Transactions. In the apps, the FAQ identifies Library and Purchased. Use those locations to compare the product name with your receipt. A failed attempt to save the title in My List and an absent transaction are separate observations. Reinstalling the app before making that comparison may remove useful local context without explaining which of the two has occurred.
Report the collection that is actually wrong
If the transaction exists but its programme cannot be opened, describe that precise combination to support. If the receipt belongs to a different account or the product is only an unpurchased catalogue listing, a watchlist change will not establish access. Keep order identifiers and account details in the private support conversation. This article describes the publisher’s documented product-library route, not a test of every app version, and it does not equate a permanent-looking watchlist tile with an unrestricted downloadable copy.