iOS Device such as iPhones and iPads only support downloading of specific types of files(depending on the apps installed, the filetype being downloaded and the version of iOS). Unfortunately there is no workaround for this as downloads like this are prevented by Apple and this cannot be change by anyone but Apple.
For this reason if you are selling videos and your customers are using iOS devices we recommend you use our Vimeo integration to sell streaming access.
For other file types we recommend trying out yourself. If the file cannot be downloaded we recommend you disable iOS downloads.
Uncheck the box Allow ios download
Click Update Settings
Once you do this customers who try to download on a iOS device will be presented with a message that tells them the file can only be downloaded on a computer and that they will need to download on a computer and then transfer the files to their iOS device.
iOS 12 does not allow for downloads of video or audio files, while iOS 13+ does allow for this type of download if you have enough cloud storage to download it, the filetype is supported by the version of iOS that in installed on the downloading phone, and the device has app installed that can open the file