A Microsoft file hosting and synchronization service.
Technically he did, although as a statement lacking necessary substance, typical for the overly polite unnecessarily repetitive canned replies provided by what experience has proven to be generally inept off-shore support people purporting to represent MS on this site. I am certainly more firmly planted in your 'with due respect' camp than not.
The key was the line "Camera Upload can only be used on one account at a time". But per usual, the ms rep just splayed the words without seeming to actually care their meaning was clear, or to explain the means to ensure that the *one* account was the Onedrive account, per the OPs actual question. I managed answer thousands and thousands of questions over 20+ years on newsgroup forums, and find it sadly amazing the people MS now call their community reps can barely string a sentence together, let alone think independently of the canned responses. But I fear I have digressed somewhat.
Go to https://go.microsoft.com/fwlink/?linkid=868284 and next to Samsung logo Samsung account, select Remove. Then disable Samsung Gallery on the phone, and you can open Onedrive and the option to upload photos should be there, about third item down the settings page as I recall. The scoop is from https://support.microsoft.com/en-us/office/samsung-gallery-and-onedrive-99c4e77b-8e63-4ddc-aede-19f81acee1a3
Either MS or Samsung should really clearly state that "Activating Samsung Gallery will disable the ability for Onedrive to monitor new phots and upload them to the Onedrive Camera Roll. Your Samsung Gallery photos will be placed in different Onedrive folder."
Randy
former msmvp-vb