Auto upload filesize threshold for cellular data

I've setup my camera app (Open Camera) to store raw image files as well as jpgs. I have also setup the Nextcloud app to upload new images even when on cellular data. This works as expected and raw images are uploaded as well. Unfortunately the raws are much larger than the jpgs, thus taking longer to upload over cellular and eating into my data plan.

It would be nice if we could set a filesize limit that can be uploaded via cellular data. It has already been discussed in #486 but I guess a separate issue was never opened about this.

Such a filesize limit would of course be applicable to all kinds of files and would even enable someone to instantly upload small videos, while waiting for wifi for larger videos.