Unable to Upload photos to Samsung Q90T TV. Please help

Purchased my Samsung Q90T 55" 2 days ago. Have the SmartThings app, using it on my iPhone XR.
The problem i am having is not being able to upload photos (Ambient mode - My Album - Select photos), i receive a message saying 'ERROR, An error occurred with your mobile and TV devices.'
I spent three hours the first evening on Samsung live chat resetting the TV smart hub, deleting and reinstalling the SmartThings app many times, nothing worked. He said that completing these things usually solved the problem.
He suggested i borrow an android phone and try that, which I completed yesterday, still unable to load photos. I have been in contact with Samsung live chat for the third day running, I am waiting for another adviser to get back to me to see if they have any ideas. In the meantime they asked me to contact SmartThings support. I have sent them an email explaining everything and am waiting for their reply.
I thought someone in the smartThings Community may be able to help. I have disconnected the sound-bar so there is nothing attached to the tv (Steven_Pochop’s suggestion for uploading ambient mode background…although i can upload the background photo).
If anyone has an idea I would be grateful to hear, otherwise the TV will be heading back to John Lewis on Saturday. They have said they will replace it this once, but if it happens on the next tv i will have to go direct to Samsung. I purchased this TV as I wanted to upload photos so they could be viewed during the day rather than a black screen - The TV just does not do what it claims to!
Please help!!