Yeah, it's the file streaming one I used to use. My use case was storing my photography collection on it. Combined with lightroom, it was terrible.
For random documents, it worked well enough. But, for that use case, I never had any issue with iCloud nor OneDrive.
I never use iCloud for massive quantities, but OneDrive would also crap out when syncing many large files (I used it as a backup for my camera while travelling earlier this year). Attempting to work with Lightroom out of that would also have it randomly stop syncing (I had checked "keep files on this device" or similar so LR always had local copies).
For random documents, it worked well enough. But, for that use case, I never had any issue with iCloud nor OneDrive.
I never use iCloud for massive quantities, but OneDrive would also crap out when syncing many large files (I used it as a backup for my camera while travelling earlier this year). Attempting to work with Lightroom out of that would also have it randomly stop syncing (I had checked "keep files on this device" or similar so LR always had local copies).