Sometimes popups in apps are too persistent, and it freaks me out. I might just not want to install some add-ons, and the deceptive design is terrible. But in this case, it's probably connected to the inability of the app to find the downloaded files. You should check the compatibility of your phone's internal and external memory. Creating banners and popups, in general, is not as simple as some think. It's very important to know the line between a useful and well-made popup and a deceptive design that would make people hate your website/app and never return. You can study these banner creation materials to see what they should look like.
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