I miss the possibility to create subfolders for (photo) albums in OneDrive.
FOR EXAMPLE:
Album "Travel"
America (subfolder of folder "Travel")
New York (subfolder of folder "America")
Florida (subfolder of folder "America")
Chicago (subfolder of folder "America")
Or for example:

Album "Kids' Pictures"
Michael (subfolder of folder "Kids' Pictures")
2015 (subfolder of folder "Michael")
01 January (subfolder of folder "2015")
02 February (subfolder of folder "2015")
...
2016 (subfolder of folder "Michael")
01 January (subfolder of folder "2016")
02 February (subfolder of folder "2016")
...
Mia (subfolder of folder "Kids' Pictures")
2018 (subfolder of folder "Mia")
01 January (subfolder of folder "2018")
02 February (subfolder of folder "2018")
...
2019 (subfolder of folder "Mia")
01 January (subfolder of folder "2019")
02 February (subfolder of folder "2019")
...

With Dropbox this possibility exists already for many years.
There you can easily copy your photos, including all subfolders, into Dropbox and Dropbox will automatically create albums with subfolders analogous to the uploaded folder structure and the photos contained therein.