Images with a transparent background (i.e., a transparent .png) can be uploaded to be used as a logo or a sticker on your video.
If you've uploaded a file in this format, yet your logo appears with a white background, the reason is likely related to an issue on Apple's end:
iOS devices (iPhone/iPad) with iOS version 13 and higher do not support transparent backgrounds, which means that the resulting image will come out with a white background.
To work around this, please follow the steps below:
- Delete the image from your local storage.
- Go to your iCloud backup settings and change it from "Optimize storage" to "Download and keep originals" (additional information can be found from Apple Support at 'Manage your photo and video storage').
- Download/transfer the image with the transparent background to your device.
- Add the image to your video.
Once you've done this, you can go back to your iCloud backup settings and change the selected setting back to "Optimize storage".