I created a logo animation on after effects and the transparent area shows black on iOS but I can see it perfectly on the laptop (OS X).
Trying to reimport the video on iOS gives an error saying it’s not compatible even if it’s in another project kinda working and perfect on the laptop
Key feature !
The solution given by @petergaraway is a standard answer from Adobe (see https://community.adobe.com/t5/premiere-rush/import-clips-with-alpha-channel/m-p/10261070?page=1) but this doesn't work on logo animation, because you can't import medias inside a template on iOS....
EDIT : actually, you can only insert transparent PNGs ! After a lot of trying, this is it.... Animate on Premiere and you're good to go
Rush supports alpha channel formats on Mac and Windows. Unfortunately, alpha is not supported on iOS other than png files. This is not just Rush; it's an Apple OS thing. Hopefully, we can find ways around this in the future.
If you have access to Premiere Pro, you can create titles (motion graphic templates) that contain alpha information and use those in Rush. Here's how https://helpx.adobe.com/premiere-pro/using/essential-graphics-panel.html#Creategraphicsinpremierepro
There are other great tutorials online as well.
Let us know if you have any other questions.