I have to agree with the other commenters here. This kind of functionality seems not only trivial to implement, but also comes across as negligent on the side of Microsoft. I mean I got the 1 TB storage option along with the other MS office products on a monthly subscription because I like Microsoft and I wanted to use their tools over other options because I thought the integration would be more seamless, but honestly with this kind of feature missing from a product I pay for monthly, I feel like it's an insult to my support as a customer. If the devs at Microsoft are having a hard time implementing it, then please contact me or let me know, so that I can then take it upon myself to build it out, free of charge, so long as MS attributes the feature to having been built by a customer because their OneDrive dev team lacked the ability to do so for a number of years.
If anyone on the dev team (if this ever reaches them), takes offence to this, then I'm not sorry, because this should be considered a basic must have feature, especially since it's present on the desktop version of the app. What's the point of having features on one platform that don't exist on another, given that there's no physical limitation of the device that would prevent the feature from existing? It's not an over sight, it's a blatant disregard for the very essence of what software development is about, and why we developers get so passionate about our jobs, because we're not supposed to just be churning the machine to print more money, we're supposed to be solving problems in the world and making the lives of our end users simpler by using that creative side of our minds to realize those solutions in a way that might make you or the user feel a sense of aw at how simple their task has become thanks to the software/machine they're using has made it.
It's the small considerations like this that, when left unconsidered, fill me with a sense of shame and disgrace for even calling myself a developer in the first place because of the utter lack of thought and consistency that is glaring in this situation.