iOS Devices 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 changed 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 them out yourself. If the file cannot be downloaded, we recommend you disable iOS downloads.
Got to the "Settings" tab
In the "Delivery Settings" tab, find "Allow download on iOS Devices"
Toggle the bar and click on "Save"
Once you do this customers who try to download on an 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 it 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 is installed on the downloading phone, and the device has the app installed that can open the file