Currently it appears the download feature on android (latest version on my pixel 6) does not allow you to pick the version to download. So if i have 2160p and 1080p version of a video i’m forced to download the 4K version or require transcoding to mobile which i want to avoid.
There’s already an existing feature suggestion asking for an option to download an optimized / specific version of a video. I suggest you comment/vote in that thread in order to avoid distracting votes.
I’ll therefore close this thread as a duplicate.
2022 clean-up: duplicate