Purchased art works from other player don't appear in the museum

[berth32dll]

I purchased 2 religious art from Kupe and 1 sculpture from Jadwiga. Why I can't put those item in the museum? How do I fix this? This effectively killed my cultural victory.
My purchased great works are visible in trade screen, but I can't see them in great works screen.

I have attached my save game.

 

[berth32dll]

For some reason, I can't upload savefile via forum, so here it is: https://we.tl/t-7UADLJ0kSO FREDERICK BARBAROSSA 318 1894 AD.Civ6Save

 

[Laurana Kanan]

For some reason, I can't upload savefile via forum

You can only upload certain file types to forum posts. For saves you need to put your save in a data container archive like a zip or rar file, which you can then upload.